Trending Categories
Trending Brands
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.
1,745 items
Sort by:
![Florence Eiseman One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/612030181/complimentary.jpg)
![Florence Eiseman One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/612030218/complimentary.jpg)
Florence Eiseman
One Piece Swimsuit
Size 9 mo
$16.99 $9.34 45% off with code GOBIG
66% off estimated retail![Unbranded One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611513141/complimentary.jpg)
![Unbranded One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611513125/complimentary.jpg)
Unbranded
One Piece Swimsuit
Size Medium kids
$12.99 $7.14 45% off with code GOBIG
51% off estimated retail![Art Class One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610001402/complimentary.jpg)
![Art Class One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610001346/complimentary.jpg)
Art Class
One Piece Swimsuit
Size X-Small kids
$9.99 $5.49 45% off with code GOBIG
41% off estimated retail![Hanna Andersson Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/612161661/complimentary.jpg)
![Hanna Andersson Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/612161648/complimentary.jpg)
Hanna Andersson
Two Piece Swimsuit
Size 10
$24.99 $13.74 45% off with code GOBIG
39% off estimated retail![Active by Old Navy Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611772698/complimentary.jpg)
![Active by Old Navy Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611772577/complimentary.jpg)
Active by Old Navy
Swimsuit Cover Up
Size 10
$12.99 $7.14 45% off with code GOBIG
48% off estimated retail![435 by Matilda Jane Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611713027/complimentary.jpg)
![435 by Matilda Jane Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611712982/complimentary.jpg)
435 by Matilda Jane
Swimsuit Cover Up
Size 14
$16.99 $9.34 45% off with code GOBIG
65% off estimated retail![Treasure & Bond Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610523026/complimentary.jpg)
![Treasure & Bond Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610522959/complimentary.jpg)
Treasure & Bond
Two Piece Swimsuit
Size 12
$17.99 $9.89 45% off with code GOBIG
45% off estimated retail![Gap Kids One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/612155497/complimentary.jpg)
![Gap Kids One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/612155555/complimentary.jpg)
Gap Kids
One Piece Swimsuit
Size Large kids
$21.99 $12.09 45% off with code GOBIG
45% off estimated retail![Florence Eiseman One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/608497456/complimentary.jpg)
![Florence Eiseman One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/608497367/complimentary.jpg)
Florence Eiseman
One Piece Swimsuit
Size 4
$22.99 $12.64 45% off with code GOBIG
75% off estimated retail![Assorted Brands Wetsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611675811/complimentary.jpg)
![Assorted Brands Wetsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611675736/complimentary.jpg)
Assorted Brands
Wetsuit
Size X-Small youth
$30.99 $17.04 45% off with code GOBIG
52% off estimated retail![Unbranded One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/612157272/complimentary.jpg)
![Unbranded One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/612157325/complimentary.jpg)
Unbranded
One Piece Swimsuit
Size 2X-large kids
$12.99 $7.14 45% off with code GOBIG
60% off estimated retail![Hanna Andersson One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611726977/complimentary.jpg)
![Hanna Andersson One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611726918/complimentary.jpg)
Hanna Andersson
One Piece Swimsuit
Size 4
$21.99 $12.09 45% off with code GOBIG
46% off estimated retail![Hanna Andersson One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611547760/complimentary.jpg)
![Hanna Andersson One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611547707/complimentary.jpg)
Hanna Andersson
One Piece Swimsuit
Size 6
$22.99 $12.64 45% off with code GOBIG
43% off estimated retail![Assorted Brands Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611252292/complimentary.jpg)
![Assorted Brands Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611252244/complimentary.jpg)
Assorted Brands
Two Piece Swimsuit
Size 12
$16.99 $9.34 45% off with code GOBIG
48% off estimated retail![Assorted Brands One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611867200/complimentary.jpg)
![Assorted Brands One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611867083/complimentary.jpg)
Assorted Brands
One Piece Swimsuit
Size 12
$11.99 $6.59 45% off with code GOBIG
63% off estimated retail![J.Crew Factory Store Two Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/611766390/complimentary.jpg)
![J.Crew Factory Store Two Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/611766329/complimentary.jpg)
J.Crew Factory Store
Two Piece Swimsuit
Size Small youth
$19.99 $10.99 45% off with code GOBIG
52% off estimated retail![Honisen One Piece Swimsuit (view 2)](https://cf-assets-thredup.thredup.com/assets/610049728/complimentary.jpg)
![Honisen One Piece Swimsuit (view 1)](https://cf-assets-thredup.thredup.com/assets/610049752/complimentary.jpg)
Honisen
One Piece Swimsuit
Size Medium youth
$9.99 $5.49 45% off with code GOBIG
37% off estimated retail![Justice Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611343316/complimentary.jpg)
![Justice Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611343298/complimentary.jpg)
Justice
Swimsuit Cover Up
Size X-Large youth
$16.99 $9.34 45% off with code GOBIG
48% off estimated retail![Gap Kids Swimsuit Cover Up (view 2)](https://cf-assets-thredup.thredup.com/assets/611046414/complimentary.jpg)
![Gap Kids Swimsuit Cover Up (view 1)](https://cf-assets-thredup.thredup.com/assets/611046241/complimentary.jpg)
Gap Kids
Swimsuit Cover Up
Size X-Large youth
$19.99 $10.99 45% off with code GOBIG
42% off estimated retail