Lukáš Rosol (Czech pronunciation: ; born 24 July 1985) is a Czech professional tennis player. Rosol competes on the ATP Challenger Tour and the ATP World Tour, both in singles and doubles. Rosol was coached by former Czech player, 1999 US Open quarterfinalist Ctislav Doseděl. His career-high singles ranking is World No. 26, achieved on 22 September 2014.
His first notable victory was against World No. 8 Jürgen Melzer at the 2011 French Open, whom he defeated in five sets in the second round a year after Melzer had reached the semi-final. A year later, Rosol defeated World No. 2 Rafael Nadal in the second round of Wimbledon to achieve one of the biggest wins in his career. Rosol has had sustained success since then having played an integral part in the Czech Republic's Davis Cup winning team in 2012, and winning his first tour-level title in April 2013.
Rosol also played in the longest ever ATP doubles match, alongside Tomáš Berdych, defeating Marco Chiudinelli and Stanislas Wawrinka in the 1st round of the 2013 Davis Cup. The match was played on 2 February 2013, lasting 7 hours, 2 minutes. It was the second longest ATP match of any kind, after the Isner–Mahut match at the 2010 Wimbledon Championships.