Boys' Swimwear

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Whether it's a day at the pool or the beach, your little man needs a comfortable and stylish look. At thredUP, you'll find boys' swimwear in a variety of styles, colors, and designs that he will love, and at up to 90% off estimated retail, the prices will make you happy as well.

3,595 items
Janie and Jack Size 0-3 mo

View Product: Janie and Jack Size 0-3 mo

Janie and Jack

Size 0-3 mo
$14.99 $31

$10.49 30% off with

Primary Clothing Size 3-6 mo

View Product: Primary Clothing Size 3-6 mo

Primary Clothing

Size 3-6 mo
$12.99 $27

$9.09 30% off with

UV Skinz Size 7

View Product: UV Skinz Size 7

UV Skinz

Size 7
$14.99 $26

$10.49 30% off with

Gap Kids Size Small kids

View Product: Gap Kids Size Small kids

Gap Kids

Size Small kids
$14.99 $32

$11.99 20% off with

Gap Kids Size 10

View Product: Gap Kids Size 10

Gap Kids

Size 10
$11.99 $32

$9.59 20% off with

Gap Kids Size Small youth

View Product: Gap Kids Size Small youth

Gap Kids

Size Small youth
$11.99 $32

$8.39 30% off with

Old Navy Size 8

View Product: Old Navy Size 8

Old Navy

Size 8
$13.99 $27

$9.79 30% off with

Old Navy Size 10
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View Product: Old Navy Size 10

Old Navy

Size 10
$12.99 $27

$7.79 40% off with

Old Navy Size 18-24 mo

View Product: Old Navy Size 18-24 mo

Old Navy

Size 18-24 mo
$11.99 $16

$9.59 20% off with

OshKosh B'gosh Size 3T

View Product: OshKosh B'gosh Size 3T

OshKosh B'gosh

Size 3T
$11.99 $21

$9.59 20% off with

Cat & Jack Size 2T

View Product: Cat & Jack Size 2T

Cat & Jack

Size 2T
$9.99 $13
Body Glove Size 5

View Product: Body Glove Size 5

Body Glove

Size 5
$12.99 $23

$10.39 20% off with

Cat & Jack Size 12 mo
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View Product: Cat & Jack Size 12 mo

Cat & Jack

Size 12 mo
$10.99 $15

$8.79 20% off with

Cat & Jack Size 4

View Product: Cat & Jack Size 4

Cat & Jack

Size 4
$11.99 $13

$9.59 20% off with

Tommy Hilfiger Size 18-24 mo

View Product: Tommy Hilfiger Size 18-24 mo

Tommy Hilfiger

Size 18-24 mo
$8.99 $18
The Children's Place Size 5

View Product: The Children's Place Size 5

The Children's Place

Size 5
$8.99 $16
Thomas & Friends Size 2T

View Product: Thomas & Friends Size 2T

Thomas & Friends

Size 2T
$7.99 $7
Cat & Jack Size X-Large youth

View Product: Cat & Jack Size X-Large youth

Cat & Jack

Size X-Large youth
$9.99 $13
Next Size 12-18 mo

View Product: Next Size 12-18 mo

Next

Size 12-18 mo
$10.99 $16

$8.79 20% off with

Old Navy Size 5

View Product: Old Navy Size 5

Old Navy

Size 5
$10.99 $16

$8.79 20% off with

Hanna Andersson Size 140 cm

View Product: Hanna Andersson Size 140 cm

Hanna Andersson

Size 140 cm
$20.99 $41

$16.79 20% off with

Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$12.99 $15

$10.39 20% off with

Hurley Size 14

View Product: Hurley Size 14

Hurley

Size 14
$12.99 $33

$10.39 20% off with

Nickelodeon Size 4T

View Product: Nickelodeon Size 4T

Nickelodeon

Size 4T
$9.99 $14
OshKosh B'gosh Size 6

View Product: OshKosh B'gosh Size 6

OshKosh B'gosh

Size 6
$11.99 $21

$9.59 20% off with

JK Kids Size Medium youth

View Product: JK Kids Size Medium youth

JK Kids

Size Medium youth
$9.99 $16
Green Sprouts Size 12 mo
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View Product: Green Sprouts Size 12 mo

Green Sprouts

Size 12 mo
$7.99 $7
Billabong Size 8

View Product: Billabong Size 8

Billabong

Size 8
$19.99 $41

$15.99 20% off with

Hurley Size 7

View Product: Hurley Size 7

Hurley

Size 7
$11.99 $33

$9.59 20% off with

Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$12.99 $26

$10.39 20% off with

Old Navy Size 6-12 mo

View Product: Old Navy Size 6-12 mo

Old Navy

Size 6-12 mo
$9.99 $14
Old Navy Size 4T

View Product: Old Navy Size 4T

Old Navy

Size 4T
$11.99 $18

$9.59 20% off with

Nickelodeon Size 3T

View Product: Nickelodeon Size 3T

Nickelodeon

Size 3T
$9.99 $14
Carter's Size 18 mo

View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$13.99 $30

$11.19 20% off with

The Incredible Hulk Size 6

View Product: The Incredible Hulk Size 6

The Incredible Hulk

Size 6
$9.99 $16
Cat & Jack Size Medium kids

View Product: Cat & Jack Size Medium kids

Cat & Jack

Size Medium kids
$12.99 $15

$10.39 20% off with

Cat & Jack Size 2T

View Product: Cat & Jack Size 2T

Cat & Jack

Size 2T
$9.99 $13
Lands' End Size 5

View Product: Lands' End Size 5

Lands' End

Size 5
$10.99 $18

$8.79 20% off with

O'Neill Size 12

View Product: O'Neill Size 12

O'Neill

Size 12
$19.99 $33

$15.99 20% off with

Lands' End Size 3T

View Product: Lands' End Size 3T

Lands' End

Size 3T
$9.99 $18
Body Glove Size 5

View Product: Body Glove Size 5

Body Glove

Size 5
$13.99 $34

$11.19 20% off with

Nautica Size Medium kids

View Product: Nautica Size Medium kids

Nautica

Size Medium kids
$10.99 $22

$8.79 20% off with

Carter's Size 3 mo

View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$10.99 $26

$8.79 20% off with

Quiksilver Size 8

View Product: Quiksilver Size 8

Quiksilver

Size 8
$11.99 $22

$9.59 20% off with

Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$23.99 $39

$16.79 30% off with

Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$10.99 $24
Carter's Size 3T
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View Product: Carter's Size 3T

Carter's

Size 3T
$11.99 $24
Cat & Jack Size 4

View Product: Cat & Jack Size 4

Cat & Jack

Size 4
$15.99 $15

$11.19 30% off with

Old Navy Size 6

View Product: Old Navy Size 6

Old Navy

Size 6
$14.99 $27

$10.49 30% off with

Carter's Size 12 mo

View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$17.99 $44

$14.39 20% off with

Aqua Sphere Size Medium kids

View Product: Aqua Sphere Size Medium kids

Aqua Sphere

Size Medium kids
$14.99 $33

$8.99 40% off with

Carter's Size 2T

View Product: Carter's Size 2T

Carter's

Size 2T
$12.99 $26

$10.39 20% off with

Baby Gap Size 4
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View Product: Baby Gap Size 4

Baby Gap

Size 4
$11.99 $20

$9.59 20% off with

UV Skinz Size 4T

View Product: UV Skinz Size 4T

UV Skinz

Size 4T
$13.99 $34

$11.19 20% off with

Koala Kids Size 0-3 mo
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View Product: Koala Kids Size 0-3 mo

Koala Kids

Size 0-3 mo
$11.99 $30
DSG Size 8
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View Product: DSG Size 8

DSG

Size 8
$11.99 $20
Jumping Beans Size 5T

View Product: Jumping Beans Size 5T

Jumping Beans

Size 5T
$15.99 $28

$12.79 20% off with

Banz Size 12 mo
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View Product: Banz Size 12 mo

Banz

Size 12 mo
$11.99 $11
Cat & Jack Size 8

View Product: Cat & Jack Size 8

Cat & Jack

Size 8
$9.99 $13
Art Class Size 8

View Product: Art Class Size 8

Art Class

Size 8
$9.99 $14
Gap Kids Size 6

View Product: Gap Kids Size 6

Gap Kids

Size 6
$15.99 $32

$12.79 20% off with

Cat & Jack Size Small youth

View Product: Cat & Jack Size Small youth

Cat & Jack

Size Small youth
$10.99 $15

$8.79 20% off with

Art Class Size 8

View Product: Art Class Size 8

Art Class

Size 8
$9.99 $14
Old Navy Size 8

View Product: Old Navy Size 8

Old Navy

Size 8
$14.99 $27

$11.99 20% off with

Carter's Size 12 mo

View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$12.99 $26

$10.39 20% off with

Lands' End Size 10

View Product: Lands' End Size 10

Lands' End

Size 10
$11.99 $22

$9.59 20% off with

Marvel Size Small youth

View Product: Marvel Size Small youth

Marvel

Size Small youth
$11.99 $22

$9.59 20% off with

O'Rageous Size Small youth

View Product: O'Rageous Size Small youth

O'Rageous

Size Small youth
$16.99 $25

$13.59 20% off with

Lands' End Size Small youth

View Product: Lands' End Size Small youth

Lands' End

Size Small youth
$10.99 $22

$8.79 20% off with

Old Navy Size 18-24 mo

View Product: Old Navy Size 18-24 mo

Old Navy

Size 18-24 mo
$11.99 $16

$9.59 20% off with

O'Neill Size 12

View Product: O'Neill Size 12

O'Neill

Size 12
$17.99 $33

$14.39 20% off with

Polarn O. Pyret Size 80 cm
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View Product: Polarn O. Pyret Size 80 cm

Polarn O. Pyret

Size 80 cm
$8.99 $18
M&S Size 3

View Product: M&S Size 3

M&S

Size 3
$11.99 $18

$9.59 20% off with

Baby Gap Size 18-24 mo

View Product: Baby Gap Size 18-24 mo

Baby Gap

Size 18-24 mo
$11.99 $21

$9.59 20% off with

Gap Kids Size 10

View Product: Gap Kids Size 10

Gap Kids

Size 10
$14.99 $32

$11.99 20% off with

Polo by Ralph Lauren Size 7

View Product: Polo by Ralph Lauren Size 7

Polo by Ralph Lauren

Size 7
$10.99 $27

$8.79 20% off with

Cat & Jack Size 8

View Product: Cat & Jack Size 8

Cat & Jack

Size 8
$8.99 $13
Polarn O. Pyret Size 80 cm
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View Product: Polarn O. Pyret Size 80 cm

Polarn O. Pyret

Size 80 cm
$8.99 $18
Exertek Size 14
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View Product: Exertek Size 14

Exertek

Size 14
$16.99 $32

$13.59 20% off with

Kana Size 18

View Product: Kana Size 18

Kana

Size 18
$11.99 $25

$9.59 20% off with

Lands' End Size 10

View Product: Lands' End Size 10

Lands' End

Size 10
$11.99 $22

$9.59 20% off with

Lands' End Size 5

View Product: Lands' End Size 5

Lands' End

Size 5
$11.99 $18

$9.59 20% off with

Hanna Andersson Size 6

View Product: Hanna Andersson Size 6

Hanna Andersson

Size 6
$16.99 $30

$13.59 20% off with

Gymboree Size 6-12 mo
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View Product: Gymboree Size 6-12 mo

Gymboree

Size 6-12 mo
$11.99 $27

$9.59 20% off with

Tahari Size 6

View Product: Tahari Size 6

Tahari

Size 6
$11.99 $22

$9.59 20% off with

Exertek Size 14
New With Tags BadgeNew With Tags

View Product: Exertek Size 14

Exertek

Size 14
$13.99 $32

$11.19 20% off with

Old Navy Size 14

View Product: Old Navy Size 14

Old Navy

Size 14
$15.99 $27

$12.79 20% off with

Gap Kids Size 6

View Product: Gap Kids Size 6

Gap Kids

Size 6
$13.99 $32

$11.19 20% off with

Cat & Jack Size X-Small youth

View Product: Cat & Jack Size X-Small youth

Cat & Jack

Size X-Small youth
$8.99 $13
Jumping Beans Size 3T
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View Product: Jumping Beans Size 3T

Jumping Beans

Size 3T
$11.99 $26

$9.59 20% off with

Hanna Andersson Size 12
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View Product: Hanna Andersson Size 12

Hanna Andersson

Size 12
$16.99 $30

$10.19 40% off with

Hanna Andersson Size 10

View Product: Hanna Andersson Size 10

Hanna Andersson

Size 10
$20.99 $30

$12.59 40% off with

Eddie Bauer Size 7

View Product: Eddie Bauer Size 7

Eddie Bauer

Size 7
$16.99 $22

$11.89 30% off with

Janie and Jack Size 7

View Product: Janie and Jack Size 7

Janie and Jack

Size 7
$15.99 $31

$11.19 30% off with

Carter's Size 6 mo
Price Drop BadgePrice Drop

View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$10.99 $24
Splash About Size X-Large kids
Price Drop BadgePrice Drop

View Product: Splash About Size X-Large kids

Splash About

Size X-Large kids
$22.99 $61

$16.09 30% off with

iXtreme Outfitters Size 14

View Product: iXtreme Outfitters Size 14

iXtreme Outfitters

Size 14
$12.99 $25

$10.39 20% off with

Cat & Jack Size 4T

View Product: Cat & Jack Size 4T

Cat & Jack

Size 4T
$11.99 $13

$9.59 20% off with

Cat & Jack Size 4T

View Product: Cat & Jack Size 4T

Cat & Jack

Size 4T
$11.99 $15

$9.59 20% off with

Gymboree Size 10

View Product: Gymboree Size 10

Gymboree

Size 10
$11.99 $27

$9.59 20% off with

Polo by Ralph Lauren Size 3

View Product: Polo by Ralph Lauren Size 3

Polo by Ralph Lauren

Size 3
$14.99 $23

$11.99 20% off with

Art Class Size 5

View Product: Art Class Size 5

Art Class

Size 5
$7.99 $11
Hurley Size 12

View Product: Hurley Size 12

Hurley

Size 12
$12.99 $33

$10.39 20% off with

Crown & Ivy Size Medium youth

View Product: Crown & Ivy Size Medium youth

Crown & Ivy

Size Medium youth
$17.99 $44

$14.39 20% off with

Disney Size 4

View Product: Disney Size 4

Disney

Size 4
$8.99 $9
Cat & Jack Size 18 mo

View Product: Cat & Jack Size 18 mo

Cat & Jack

Size 18 mo
$9.99 $13
Disney Size 7

View Product: Disney Size 7

Disney

Size 7
$8.99 $11
Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$11.99 $15

$9.59 20% off with

Polo by Ralph Lauren Size 14

View Product: Polo by Ralph Lauren Size 14

Polo by Ralph Lauren

Size 14
$13.99 $27

$11.19 20% off with

ZeroXposur Size 10

View Product: ZeroXposur Size 10

ZeroXposur

Size 10
$11.99 $27

$9.59 20% off with

Columbia Size 14

View Product: Columbia Size 14

Columbia

Size 14
$12.99 $22

$10.39 20% off with

Andy & Evan Size 3-6 mo
Price Drop BadgePrice Drop

View Product: Andy & Evan Size 3-6 mo

Andy & Evan

Size 3-6 mo
$21.99 $102

$15.39 30% off with

Assorted Brands Size 12

View Product: Assorted Brands Size 12

Assorted Brands

Size 12
$16.99 $33

$11.89 30% off with

Carter's Size 18 mo
Price Drop BadgePrice Drop

View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$14.99 $24

$11.99 20% off with

Tea Size 6-12 mo
Price Drop BadgePrice Drop

View Product: Tea Size 6-12 mo

Tea

Size 6-12 mo
$22.99 $35

$11.49 50% off with

Lands' End Size 8

View Product: Lands' End Size 8

Lands' End

Size 8
$13.99 $27

$8.39 40% off with

Old Navy Size 14

View Product: Old Navy Size 14

Old Navy

Size 14
$14.99 $27

$11.99 20% off with

Assorted Brands Size Small youth

View Product: Assorted Brands Size Small youth

Assorted Brands

Size Small youth
$13.99 $33

$11.19 20% off with

Hurley Size 8

View Product: Hurley Size 8

Hurley

Size 8
$12.99 $33

$10.39 20% off with

Gymboree Size 5T

View Product: Gymboree Size 5T

Gymboree

Size 5T
$11.99 $27

$9.59 20% off with

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