Karoline Nemetz (married name: Ettemark; born 28 June 1958) is a Swedish former middle- and long-distance runner.

Nemetz grew up in Eskilstuna and began competing in athletics and skiing.

[1] Nemetz won her first major medal at the 1980 World Championships in Athletics.

This was a two-event competition created by the International Amateur Athletics Federation in response to the lack of the women's 400 metres hurdles and 3000 m run at the 1980 Summer Olympics.

Nemetz's time stood for almost sixteen years, at which point Sara Wedlund improved the mark by a second and a half.