Apavatn (Icelandic pronunciation: [ˈaːpaˌvahtn̥] ^ⓘ) is a lake in southwest Iceland. With a surface area of around 13 km² it is much larger than the neighbouring lake of Laugarvatn, which lies to the north of Apavatn.

Apavatn is renowned for its good fishing, especially trout.

• List of lakes of Iceland

• https://web.archive.org/web/20040513214304/http://nat.is/nateng/apavatn.htm (Information)
• http://www.arctic-images.com/picture_gallery/Hot/hot_pages/pages/Apavatn.htm (Photo)