Nikša Roki (born February 8, 1988) is a Croatian swimmer, who specialized in butterfly and individual medley events. He represented his nation Croatia at the 2008 Summer Olympics, and has claimed multiple-time Croatian championship titles and national records throughout his swimming career in the 200 m butterfly and the individual medley double (both 200 and 400 m). Roki is currently a graduate student at the University of Maryland, College Park and is a teaching assistant for freshman level bioengineering courses.