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Whether it's for summertime or swimming lessons, your girls need the right gear for when they dive into the water. Check out thredUP's selection of girls' swimwear to discover items from top brands at up to 90% off estimated retail.

$25 - $50Remove filter
59 items
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    Trina Turk One Piece Swimsuit (view 2)Trina Turk One Piece Swimsuit (view 1)
    View Product: Trina Turk One Piece Swimsuit

    Trina Turk

    One Piece Swimsuit
    Size Small kids
    $31.99
    52% off estimated retail
    Speedo One Piece Swimsuit (view 2)Speedo One Piece Swimsuit (view 1)
    View Product: Speedo One Piece Swimsuit

    Speedo

    One Piece Swimsuit
    Size Medium kids
    $28.99
    60% off estimated retail
    Athleta One Piece Swimsuit (view 2)Athleta One Piece Swimsuit (view 1)
    View Product: Athleta One Piece Swimsuit

    Athleta

    One Piece Swimsuit
    Size 12
    $33.99
    30% off estimated retail
    Athleta One Piece Swimsuit (view 2)Athleta One Piece Swimsuit (view 1)
    View Product: Athleta One Piece Swimsuit

    Athleta

    One Piece Swimsuit
    Size 7
    $30.99
    36% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Old Navy One Piece Swimsuit (view 2)Old Navy One Piece Swimsuit (view 1)
    View Product: Old Navy One Piece Swimsuit

    Old Navy

    One Piece Swimsuit
    Size 2X-large kids
    $27.99
    37% off estimated retail
    Zimmermann One Piece Swimsuit (view 2)Zimmermann One Piece Swimsuit (view 1)Flawed Gem
    View Product: Zimmermann One Piece Swimsuit

    Zimmermann

    One Piece Swimsuit
    Size 6
    $38.99
    71% off estimated retail
    Athleta One Piece Swimsuit (view 2)Athleta One Piece Swimsuit (view 1)
    View Product: Athleta One Piece Swimsuit

    Athleta

    One Piece Swimsuit
    Size 12
    $28.99
    40% off estimated retail
    Lilly Pulitzer One Piece Swimsuit (view 2)Lilly Pulitzer One Piece Swimsuit (view 1)
    View Product: Lilly Pulitzer One Piece Swimsuit

    Lilly Pulitzer

    One Piece Swimsuit
    Size 10
    $29.99
    38% off estimated retail
    Lilly Pulitzer One Piece Swimsuit (view 2)Lilly Pulitzer One Piece Swimsuit (view 1)
    View Product: Lilly Pulitzer One Piece Swimsuit

    Lilly Pulitzer

    One Piece Swimsuit
    Size 12
    $29.99
    38% off estimated retail
    Hurley Wetsuit (view 2)Hurley Wetsuit (view 1)
    View Product: Hurley Wetsuit

    Hurley

    Wetsuit
    Size 8
    $30.99
    68% off estimated retail
    Speedo One Piece Swimsuit (view 2)Speedo One Piece Swimsuit (view 1)
    View Product: Speedo One Piece Swimsuit

    Speedo

    One Piece Swimsuit
    Size 14
    $41.99
    42% off estimated retail
    Platinum One Piece Swimsuit (view 2)Platinum One Piece Swimsuit (view 1)New With Tags
    View Product: Platinum One Piece Swimsuit

    Platinum

    One Piece Swimsuit
    Size 14
    $34.99
    56% off estimated retail
    Little Rhona One Piece Swimsuit (view 2)Little Rhona One Piece Swimsuit (view 1)
    View Product: Little Rhona One Piece Swimsuit

    Little Rhona

    One Piece Swimsuit
    Size 4T
    $30.99
    62% off estimated retail
    Pixie Girl One Piece Swimsuit (view 2)Pixie Girl One Piece Swimsuit (view 1)
    View Product: Pixie Girl One Piece Swimsuit

    Pixie Girl

    One Piece Swimsuit
    Size 14
    $28.99
    64% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 10
    $28.99
    51% off estimated retail
    Maaji Rash Guard (view 2)Maaji Rash Guard (view 1)
    View Product: Maaji Rash Guard

    Maaji

    Rash Guard
    Size 10
    $29.99
    69% off estimated retail
    Les Tout Petits Two Piece Swimsuit (view 2)Les Tout Petits Two Piece Swimsuit (view 1)
    View Product: Les Tout Petits Two Piece Swimsuit

    Les Tout Petits

    Two Piece Swimsuit
    Size 16
    $36.99
    76% off estimated retail
    OndadeMar Two Piece Swimsuit (view 2)OndadeMar Two Piece Swimsuit (view 1)New With Tags
    View Product: OndadeMar Two Piece Swimsuit

    OndadeMar

    Two Piece Swimsuit
    Size 14
    $35.99
    80% off estimated retail
    Lands' End One Piece Swimsuit (view 2)Lands' End One Piece Swimsuit (view 1)
    View Product: Lands' End One Piece Swimsuit

    Lands' End

    One Piece Swimsuit
    Size 14
    $27.99
    70% off estimated retail
    Mudpie Baby One Piece Swimsuit (view 2)Mudpie Baby One Piece Swimsuit (view 1)
    View Product: Mudpie Baby One Piece Swimsuit

    Mudpie Baby

    One Piece Swimsuit
    Size 6-9 mo
    $29.99 $22.49 25% off with code THANKU
    53% off estimated retail
    Egg New York One Piece Swimsuit (view 2)Egg New York One Piece Swimsuit (view 1)
    View Product: Egg New York One Piece Swimsuit

    Egg New York

    One Piece Swimsuit
    Size 3T
    $33.99 $23.79 30% off with code THANKU
    58% off estimated retail
    Stella McCartney One Piece Swimsuit (view 2)Stella McCartney One Piece Swimsuit (view 1)
    View Product: Stella McCartney One Piece Swimsuit

    Stella McCartney

    One Piece Swimsuit
    Size 4
    $34.99 $24.49 30% off with code THANKU
    56% off estimated retail
    Molo Two Piece Swimsuit (view 2)Molo Two Piece Swimsuit (view 1)
    View Product: Molo Two Piece Swimsuit

    Molo

    Two Piece Swimsuit
    Size 7
    $30.99 $21.69 30% off with code THANKU
    62% off estimated retail
    Floatimini Two Piece Swimsuit (view 2)Floatimini Two Piece Swimsuit (view 1)
    View Product: Floatimini Two Piece Swimsuit

    Floatimini

    Two Piece Swimsuit
    Size 10
    $28.99 $20.29 30% off with code THANKU
    64% off estimated retail
    Athleta One Piece Swimsuit (view 2)Athleta One Piece Swimsuit (view 1)
    View Product: Athleta One Piece Swimsuit

    Athleta

    One Piece Swimsuit
    Size 8
    $27.99 $16.79 40% off with code THANKU
    42% off estimated retail
    Molo One Piece Swimsuit (view 2)Molo One Piece Swimsuit (view 1)
    View Product: Molo One Piece Swimsuit

    Molo

    One Piece Swimsuit
    Size 5
    $27.99 $19.59 30% off with code THANKU
    58% off estimated retail
    Unbranded Wetsuit (view 2)Unbranded Wetsuit (view 1)
    View Product: Unbranded Wetsuit

    Unbranded

    Wetsuit
    Size Small kids
    $28.99 $23.19 20% off with code THANKU
    61% off estimated retail
    Vilebrequin Rash Guard (view 2)Vilebrequin Rash Guard (view 1)
    View Product: Vilebrequin Rash Guard

    Vilebrequin

    Rash Guard
    Size 14
    $29.99 $20.99 30% off with code THANKU
    79% off estimated retail
    Janie and Jack Two Piece Swimsuit (view 2)Janie and Jack Two Piece Swimsuit (view 1)
    View Product: Janie and Jack Two Piece Swimsuit

    Janie and Jack

    Two Piece Swimsuit
    Size 18-24 mo
    $29.99 $19.49 35% off with code THANKU
    28% off estimated retail
    TiA CiBANi Kids One Piece Swimsuit (view 2)TiA CiBANi Kids One Piece Swimsuit (view 1)
    View Product: TiA CiBANi Kids One Piece Swimsuit

    TiA CiBANi Kids

    One Piece Swimsuit
    Size 7
    $37.99 $24.69 35% off with code THANKU
    76% off estimated retail
    O'Neill Wetsuit (view 2)O'Neill Wetsuit (view 1)
    View Product: O'Neill Wetsuit

    O'Neill

    Wetsuit
    Size 6
    $30.99 $18.59 40% off with code THANKU
    52% off estimated retail
    Milly Minis Swimsuit Cover Up (view 2)Milly Minis Swimsuit Cover Up (view 1)
    View Product: Milly Minis Swimsuit Cover Up

    Milly Minis

    Swimsuit Cover Up
    Size 14
    $31.99 $20.79 35% off with code THANKU
    83% off estimated retail
    Unbranded Wetsuit (view 2)Unbranded Wetsuit (view 1)
    View Product: Unbranded Wetsuit

    Unbranded

    Wetsuit
    Size Large kids
    $28.99 $23.19 20% off with code THANKU
    61% off estimated retail
    Speedo One Piece Swimsuit (view 2)Speedo One Piece Swimsuit (view 1)
    View Product: Speedo One Piece Swimsuit

    Speedo

    One Piece Swimsuit
    Size 8
    $38.99 $23.39 40% off with code THANKU
    46% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 7
    $29.99 $19.49 35% off with code THANKU
    50% off estimated retail
    PQ Swim Two Piece Swimsuit (view 2)PQ Swim Two Piece Swimsuit (view 1)
    View Product: PQ Swim Two Piece Swimsuit

    PQ Swim

    Two Piece Swimsuit
    Size 14
    $29.99 $17.99 40% off with code THANKU
    73% off estimated retail
    Sol Angeles One Piece Swimsuit (view 2)Sol Angeles One Piece Swimsuit (view 1)
    View Product: Sol Angeles One Piece Swimsuit

    Sol Angeles

    One Piece Swimsuit
    Size 6X
    $28.99 $20.29 30% off with code THANKU
    64% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 10
    $29.99 $17.99 40% off with code THANKU
    50% off estimated retail
    Monnalisa Two Piece Swimsuit (view 2)Monnalisa Two Piece Swimsuit (view 1)
    View Product: Monnalisa Two Piece Swimsuit

    Monnalisa

    Two Piece Swimsuit
    Size 6
    $31.99 $20.79 35% off with code THANKU
    78% off estimated retail
    Floatimini One Piece Swimsuit (view 2)Floatimini One Piece Swimsuit (view 1)
    View Product: Floatimini One Piece Swimsuit

    Floatimini

    One Piece Swimsuit
    Size 6
    $33.99 $25.49 25% off with code THANKU
    58% off estimated retail
    Peixoto Rash Guard (view 2)Peixoto Rash Guard (view 1)
    View Product: Peixoto Rash Guard

    Peixoto

    Rash Guard
    Size 10
    $27.99 $22.39 20% off with code THANKU
    65% off estimated retail
    Tommy Bahama One Piece Swimsuit (view 2)Tommy Bahama One Piece Swimsuit (view 1)
    View Product: Tommy Bahama One Piece Swimsuit

    Tommy Bahama

    One Piece Swimsuit
    Size 6
    $32.99 $26.39 20% off with code THANKU
    19% off estimated retail
    Kenzo Kids One Piece Swimsuit (view 2)Kenzo Kids One Piece Swimsuit (view 1)
    View Product: Kenzo Kids One Piece Swimsuit

    Kenzo Kids

    One Piece Swimsuit
    Size 3
    $40.99 $30.74 25% off with code THANKU
    62% off estimated retail
    PilyQ Two Piece Swimsuit (view 2)PilyQ Two Piece Swimsuit (view 1)
    View Product: PilyQ Two Piece Swimsuit

    PilyQ

    Two Piece Swimsuit
    Size 10
    $29.99 $20.99 30% off with code THANKU
    69% off estimated retail
    Hanna Andersson One Piece Swimsuit (view 2)Hanna Andersson One Piece Swimsuit (view 1)
    View Product: Hanna Andersson One Piece Swimsuit

    Hanna Andersson

    One Piece Swimsuit
    Size 10
    $29.99 $16.49 45% off with code THANKU
    60% off estimated retail
    Hanna Andersson Rash Guard (view 2)Hanna Andersson Rash Guard (view 1)
    View Product: Hanna Andersson Rash Guard

    Hanna Andersson

    Rash Guard
    Size 140 cm
    $27.99 $18.19 35% off with code THANKU
    31% off estimated retail
    Assorted Brands Wetsuit (view 2)Assorted Brands Wetsuit (view 1)
    View Product: Assorted Brands Wetsuit

    Assorted Brands

    Wetsuit
    Size X-Large youth Plus
    $35.99 $28.79 20% off with code THANKU
    52% off estimated retail
    Assorted Brands One Piece Swimsuit (view 2)Assorted Brands One Piece Swimsuit (view 1)
    View Product: Assorted Brands One Piece Swimsuit

    Assorted Brands

    One Piece Swimsuit
    Size X-Large kids
    $38.99 $27.29 30% off with code THANKU
    70% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 14
    $27.99 $18.19 35% off with code THANKU
    70% off estimated retail
    Assorted Brands Wetsuit (view 2)Assorted Brands Wetsuit (view 1)
    View Product: Assorted Brands Wetsuit

    Assorted Brands

    Wetsuit
    Size Large kids
    $28.99 $23.19 20% off with code THANKU
    61% off estimated retail
    Lands' End Swimsuit Cover Up (view 2)Lands' End Swimsuit Cover Up (view 1)
    View Product: Lands' End Swimsuit Cover Up

    Lands' End

    Swimsuit Cover Up
    Size 6
    $29.99 $16.49 45% off with code THANKU
    18% off estimated retail
    Vilebrequin One Piece Swimsuit (view 2)Vilebrequin One Piece Swimsuit (view 1)
    View Product: Vilebrequin One Piece Swimsuit

    Vilebrequin

    One Piece Swimsuit
    Size 6
    $29.99 $20.99 30% off with code THANKU
    79% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 16
    $28.99 $18.84 35% off with code THANKU
    51% off estimated retail
    Floatimini One Piece Swimsuit (view 2)Floatimini One Piece Swimsuit (view 1)
    View Product: Floatimini One Piece Swimsuit

    Floatimini

    One Piece Swimsuit
    Size 10
    $30.99 $21.69 30% off with code THANKU
    62% off estimated retail
    Zimmermann One Piece Swimsuit (view 2)Zimmermann One Piece Swimsuit (view 1)Price Drop
    View Product: Zimmermann One Piece Swimsuit

    Zimmermann

    One Piece Swimsuit
    Size 12-24 mo
    $40.99 $28.69 30% off with code THANKU
    60% off estimated retail
    Assorted Brands Wetsuit (view 2)Assorted Brands Wetsuit (view 1)
    View Product: Assorted Brands Wetsuit

    Assorted Brands

    Wetsuit
    Size Medium infants
    $29.99 $23.99 20% off with code THANKU
    60% off estimated retail
    Assorted Brands Wetsuit (view 2)Assorted Brands Wetsuit (view 1)Price Drop
    View Product: Assorted Brands Wetsuit

    Assorted Brands

    Wetsuit
    Size 20
    $27.99 $20.99 25% off with code THANKU
    56% off estimated retail
    Assorted Brands One Piece Swimsuit (view 2)Assorted Brands One Piece Swimsuit (view 1)Price Drop
    View Product: Assorted Brands One Piece Swimsuit

    Assorted Brands

    One Piece Swimsuit
    Size 6
    $37.99 $24.69 35% off with code THANKU
    72% off estimated retail
    Assorted Brands Rash Guard (view 2)Assorted Brands Rash Guard (view 1)Price Drop
    View Product: Assorted Brands Rash Guard

    Assorted Brands

    Rash Guard
    Size Large youth
    $27.99 $19.59 30% off with code THANKU
    63% off estimated retail
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