Luka Gregorc (born 14 February 1984) is a Slovenian former professional tennis player, who achieved a career-high singles ranking of No.

He had success at junior Grand Slam tournaments, reaching the quarterfinals of the U.S. Open in 2001 and Wimbledon in 2002.

Gregorc played singles and doubles for Slovenia's Davis Cup team from 2004 through 2010, partnering Marko Tkalec once and Grega Žemlja multiple times.

In July 2006, Gregorc won his first title at a Futures tournament in Venezuela, defeating home favorite Yohny Romero in the final, 1–6, 6–0, 6–3.

In September 2006, Gregorc qualified for the China Open in Beijing and defeated Wang Yu, to whom he had lost the previous year, to win his first ATP main-draw match.