Ondřej Synek (Czech pronunciation: [ˈondr̝ɛj ˈsɪnɛk]; born 13 October 1982 in Stará Boleslav) is a former Czech rower. He is a five-times World Champion in Single Sculls, winning in 2010, 2013, 2014, 2015 and 2017. He won Olympic silver medals at the 2008 Summer Olympics in Beijing and 2012 Summer Olympics in London. In Beijing he came in as the chief rival of Mahé Drysdale, but despite Drysdale coming down with a painful stomach flu and falling in the final stages of the final to bronze, he was upset for the gold by defending Olympic Champion Olaf Tufte, who Synek had regularly been beating the previous couple years. In London he came in co favored for gold with Drysdale after trading gold and silver at the previous 2 World Championships, but fell short to Drysdale in the final.