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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.

20Remove filter9-12 moRemove filter4TRemove filter
54 items
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    Old Navy Wetsuit (view 2)Old Navy Wetsuit (view 1)
    View Product: Old Navy Wetsuit

    Old Navy

    Wetsuit
    Size 4T
    $11.99
    42% off estimated retail
    Disney Two Piece Swimsuit (view 2)Disney Two Piece Swimsuit (view 1)
    View Product: Disney Two Piece Swimsuit

    Disney

    Two Piece Swimsuit
    Size 4T
    $9.99
    28% off estimated retail
    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 4T
    $12.99
    27% off estimated retail
    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 4T
    $10.99
    38% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $8.99
    47% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $12.99
    23% off estimated retail
    Baby Gap One Piece Swimsuit (view 2)Baby Gap One Piece Swimsuit (view 1)
    View Product: Baby Gap One Piece Swimsuit

    Baby Gap

    One Piece Swimsuit
    Size 4T
    $14.99
    44% off estimated retail
    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 4T
    $13.99
    22% off estimated retail
    UV Skinz Rash Guard (view 2)UV Skinz Rash Guard (view 1)
    View Product: UV Skinz Rash Guard

    UV Skinz

    Rash Guard
    Size 4T
    $16.99
    52% off estimated retail
    Cecil and Lou Two Piece Swimsuit (view 2)Cecil and Lou Two Piece Swimsuit (view 1)
    View Product: Cecil and Lou Two Piece Swimsuit

    Cecil and Lou

    Two Piece Swimsuit
    Size 4T
    $7.99
    55% off estimated retail
    Old Navy Wetsuit (view 2)Old Navy Wetsuit (view 1)
    View Product: Old Navy Wetsuit

    Old Navy

    Wetsuit
    Size 4T
    $10.99
    47% off estimated retail
    OshKosh B'gosh Two Piece Swimsuit (view 2)OshKosh B'gosh Two Piece Swimsuit (view 1)
    View Product: OshKosh B'gosh Two Piece Swimsuit

    OshKosh B'gosh

    Two Piece Swimsuit
    Size 4T
    $14.99
    44% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $13.99
    17% off estimated retail
    TYR One Piece Swimsuit (view 2)TYR One Piece Swimsuit (view 1)New With Tags
    View Product: TYR One Piece Swimsuit

    TYR

    One Piece Swimsuit
    Size 20
    $33.99
    60% off estimated retail
    Kamik Two Piece Swimsuit (view 2)Kamik Two Piece Swimsuit (view 1)New With Tags
    View Product: Kamik Two Piece Swimsuit

    Kamik

    Two Piece Swimsuit
    Size 4T
    $20.99
    40% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $11.99
    47% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $15.99 $12.79 20% off with code HOTDEAL
    23% off estimated retail
    Cabanalife Rash Guard (view 2)Cabanalife Rash Guard (view 1)
    View Product: Cabanalife Rash Guard

    Cabanalife

    Rash Guard
    Size 4T
    $11.99 $9.59 20% off with code HOTDEAL
    14% off estimated retail
    Carter's Two Piece Swimsuit (view 2)Carter's Two Piece Swimsuit (view 1)
    View Product: Carter's Two Piece Swimsuit

    Carter's

    Two Piece Swimsuit
    Size 4T
    $13.99 $11.19 20% off with code HOTDEAL
    69% off estimated retail
    Sporto One Piece Swimsuit (view 2)Sporto One Piece Swimsuit (view 1)Flawed Gem
    View Product: Sporto One Piece Swimsuit

    Sporto

    One Piece Swimsuit
    Size 20
    $14.99 $11.99 20% off with code HOTDEAL
    48% off estimated retail
    Tea Rash Guard (view 2)Tea Rash Guard (view 1)
    View Product: Tea Rash Guard

    Tea

    Rash Guard
    Size 9-12 mo
    $17.99 $12.59 30% off with code HOTDEAL
    44% off estimated retail
    Dolfin One Piece Swimsuit (view 2)Dolfin One Piece Swimsuit (view 1)
    View Product: Dolfin One Piece Swimsuit

    Dolfin

    One Piece Swimsuit
    Size 4T
    $13.99 $10.49 25% off with code HOTDEAL
    23% off estimated retail
    Assorted Brands Rash Guard (view 2)Assorted Brands Rash Guard (view 1)
    View Product: Assorted Brands Rash Guard

    Assorted Brands

    Rash Guard
    Size 4T
    $11.99 $9.59 20% off with code HOTDEAL
    59% off estimated retail
    Limited Too Two Piece Swimsuit (view 2)Limited Too Two Piece Swimsuit (view 1)
    View Product: Limited Too Two Piece Swimsuit

    Limited Too

    Two Piece Swimsuit
    Size 4T
    $11.99 $9.59 20% off with code HOTDEAL
    63% off estimated retail
    Carter's Rash Guard (view 2)Carter's Rash Guard (view 1)
    View Product: Carter's Rash Guard

    Carter's

    Rash Guard
    Size 4T
    $12.99 $10.39 20% off with code HOTDEAL
    63% off estimated retail
    Cat & Jack One Piece Swimsuit (view 2)Cat & Jack One Piece Swimsuit (view 1)
    View Product: Cat & Jack One Piece Swimsuit

    Cat & Jack

    One Piece Swimsuit
    Size 4T
    $15.99 $12.79 20% off with code HOTDEAL
    23% off estimated retail
    Justice One Piece Swimsuit (view 2)Justice One Piece Swimsuit (view 1)
    View Product: Justice One Piece Swimsuit

    Justice

    One Piece Swimsuit
    Size 20
    $16.99 $11.89 30% off with code HOTDEAL
    44% off estimated retail
    Cat & Jack Rash Guard (view 2)Cat & Jack Rash Guard (view 1)
    View Product: Cat & Jack Rash Guard

    Cat & Jack

    Rash Guard
    Size 4T
    $5.99 $4.79 20% off with code HOTDEAL
    50% off estimated retail
    The Finals One Piece Swimsuit (view 2)The Finals One Piece Swimsuit (view 1)New With Tags
    View Product: The Finals One Piece Swimsuit

    The Finals

    One Piece Swimsuit
    Size 20
    $19.99 $13.99 30% off with code HOTDEAL
    63% off estimated retail
    Hula Star Two Piece Swimsuit (view 2)Hula Star Two Piece Swimsuit (view 1)
    View Product: Hula Star Two Piece Swimsuit

    Hula Star

    Two Piece Swimsuit
    Size 4T
    $12.99 $10.39 20% off with code HOTDEAL
    40% off estimated retail
    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 4T
    $11.99 $8.99 25% off with code HOTDEAL
    38% off estimated retail
    Speedo One Piece Swimsuit (view 2)Speedo One Piece Swimsuit (view 1)New With Tags
    View Product: Speedo One Piece Swimsuit

    Speedo

    One Piece Swimsuit
    Size 20
    $37.99 $22.79 40% off with code HOTDEAL
    49% off estimated retail
    UV Skinz Rash Guard (view 2)UV Skinz Rash Guard (view 1)
    View Product: UV Skinz Rash Guard

    UV Skinz

    Rash Guard
    Size 4T
    $15.99 $12.79 20% off with code HOTDEAL
    61% off estimated retail
    Gymboree Rash Guard (view 2)Gymboree Rash Guard (view 1)
    View Product: Gymboree Rash Guard

    Gymboree

    Rash Guard
    Size 4T
    $17.99 $14.39 20% off with code HOTDEAL
    34% off estimated retail
    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 4T
    $11.99 $9.59 20% off with code HOTDEAL
    38% off estimated retail
    Sporti One Piece Swimsuit (view 2)Sporti One Piece Swimsuit (view 1)
    View Product: Sporti One Piece Swimsuit

    Sporti

    One Piece Swimsuit
    Size 20
    $10.99 $8.79 20% off with code HOTDEAL
    37% 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 4T
    $22.99 $17.24 25% off with code HOTDEAL
    72% off estimated retail
    Carter's One Piece Swimsuit (view 2)Carter's One Piece Swimsuit (view 1)
    View Product: Carter's One Piece Swimsuit

    Carter's

    One Piece Swimsuit
    Size 4T
    $18.99 $15.19 20% off with code HOTDEAL
    59% off estimated retail
    Floatimini Rash Guard (view 2)Floatimini Rash Guard (view 1)
    View Product: Floatimini Rash Guard

    Floatimini

    Rash Guard
    Size 4T
    $24.99 $17.49 30% off with code HOTDEAL
    66% off estimated retail
    Gymboree Rash Guard (view 2)Gymboree Rash Guard (view 1)Price Drop
    View Product: Gymboree Rash Guard

    Gymboree

    Rash Guard
    Size 4T
    $13.99 $11.19 20% off with code HOTDEAL
    47% off estimated retail
    Mud Pie One Piece Swimsuit (view 2)Mud Pie One Piece Swimsuit (view 1)Price Drop
    View Product: Mud Pie One Piece Swimsuit

    Mud Pie

    One Piece Swimsuit
    Size 9-12 mo
    $12.99 $10.39 20% off with code HOTDEAL
    45% off estimated retail
    Tea One Piece Swimsuit (view 2)Tea One Piece Swimsuit (view 1)Price Drop
    View Product: Tea One Piece Swimsuit

    Tea

    One Piece Swimsuit
    Size 9-12 mo
    $22.99 $17.24 25% off with code HOTDEAL
    60% off estimated retail
    UV Skinz Rash Guard (view 2)UV Skinz Rash Guard (view 1)
    View Product: UV Skinz Rash Guard

    UV Skinz

    Rash Guard
    Size 4T
    $18.99 $11.39 40% off with code HOTDEAL
    52% off estimated retail
    Penelope Mack One Piece Swimsuit (view 2)Penelope Mack One Piece Swimsuit (view 1)Price Drop
    View Product: Penelope Mack One Piece Swimsuit

    Penelope Mack

    One Piece Swimsuit
    Size 4T
    $18.99 $12.34 35% off with code HOTDEAL
    40% off estimated retail
    Unbranded One Piece Swimsuit (view 2)Unbranded One Piece Swimsuit (view 1)Price Drop
    View Product: Unbranded One Piece Swimsuit

    Unbranded

    One Piece Swimsuit
    Size 4T
    $11.99 $7.79 35% off with code HOTDEAL
    59% off estimated retail
    Unbranded Board Shorts (view 2)Unbranded Board Shorts (view 1)Price Drop
    View Product: Unbranded Board Shorts

    Unbranded

    Board Shorts
    Size 20
    $12.99 $8.44 35% off with code HOTDEAL
    45% 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
    $31.99 $19.19 40% off with code HOTDEAL
    56% 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
    $28.99 $17.39 40% off with code HOTDEAL
    60% off estimated retail
    Circo One Piece Swimsuit (view 2)Circo One Piece Swimsuit (view 1)Price Drop
    View Product: Circo One Piece Swimsuit

    Circo

    One Piece Swimsuit
    Size 4T
    $11.99 $7.19 40% off with code HOTDEAL
    28% off estimated retail
    Old Navy Rash Guard (view 2)Old Navy Rash Guard (view 1)Price Drop
    View Product: Old Navy Rash Guard

    Old Navy

    Rash Guard
    Size 4T
    $10.99 $6.59 40% off with code HOTDEAL
    28% off estimated retail
    UV Skinz Wetsuit (view 2)UV Skinz Wetsuit (view 1)Price Drop
    View Product: UV Skinz Wetsuit

    UV Skinz

    Wetsuit
    Size 4T
    $36.99 $20.34 45% off with code HOTDEAL
    55% off estimated retail
    Lands' End Rash Guard (view 2)Lands' End Rash Guard (view 1)Price Drop
    View Product: Lands' End Rash Guard

    Lands' End

    Rash Guard
    Size 4T
    $11.99 $7.19 40% off with code HOTDEAL
    60% off estimated retail
    Disney One Piece Swimsuit (view 2)Disney One Piece Swimsuit (view 1)Price Drop
    View Product: Disney One Piece Swimsuit

    Disney

    One Piece Swimsuit
    Size 9-12 mo
    $11.99 $7.19 40% off with code HOTDEAL
    52% 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 4T
    $12.24 $7.34 40% off with code HOTDEAL
    63% off estimated retail
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