Ott Sepp (born June 29, 1982) is an Estonian actor, comedian, singer, writer and television presenter.

Born in Tallinn, Sepp graduated from the Estonian Academy of Music and Theatre in 2004 and began performing at the Estonian Drama Theatre in 2005. Since 2006 he has been a principal actor at the Vanemuine theater in Tartu. Sepp has had prominent roles in Estonian films such as Names in Marble (2002), Malev (2005) and Tulnukas (2006); the latter two of which also featured his frequent television partner Märt Avandi. The two men have worked together as co-hosts of Eesti otsib superstaari (English: Estonia is Searching for a Superstar, the Estonian version of Pop Idol) in 2008 and performed together on the comedic parody television program Tujurikkuja (2008 – 2016), as well as co-hosting Eesti laul in both 2010 and 2011. In 2016, Ott Sepp and Märt Avandi hosted the final of Eesti Laul in Saku Suurhall. Eesti laul is Estonia's televised competition to select the country's Eurovision entry and singer.

Sepp has appeared in stage productions at the Vanemuine theatre based on the works of: Oskar Luts, Rudyard Kipling, Juhan Liiv, Emily Brontë, George Bernard Shaw, Ole Lund Kirkegaard, Edward Albee and William Shakespeare.

In 2021, Sepp took part in a number of videos titled Toidukool (Food School) promoting meat consumption on the website Lihafaktid (Meat Facts) for the European Livestock Voice, compiled by the Estonian Chamber of Agriculture and Commerce.