Omar Jasika (born 18 May 1997) is an Australian tennis player. Jasika is the current holder of the US Open boys' singles defeating Quentin Halys 2–6, 7–5, 6–1 in the final. Jasika along with Naoki Nakagawa is also the current holder of the US Open boy's doubles title after defeating Rafael Matos and João Menezes 6–3, 7–6(8–6) in the final. In winning both, Jasika became the first player in 28 years to win both the boys’s singles and doubles events at the US Open.
Jasika has a career high singles ranking of 259 achieved on 3 August 2015.
Jasika made his grand slam debut at the 2016 Australian Open after being awarded a wild card.  He won his first round match, beating Illya Marchenko in 4 sets; he subsequently lost to former finalist Jo-Wilfried Tsonga in the following round in straight sets.