Ondřej Lieser (born 12 August 1991) is a Czech professional golfer who plays on the European Tour.

[1] In 2020 he became the first golfer from the Czech Republic to win on the Challenge Tour with victory at the Andalucía Challenge de España,[2] and the first Czech golfer to gain a full playing card on the European Tour.

[8] In 2020, Lieser finished tied for fourth place at the Italian Challenge Open Eneos Motor Oil in October before winning the Andalucía Challenge de España in Cadiz in November, two strokes ahead of Richard Mansell.

[9] With the victory, Lieser moved into sixth place on the Order of Merit and secured his spot in the season-ending Challenge Tour Grand Final.

[2] Lieser went on to win the Grand Final and by doing so; claimed the Order of Merit title, becoming the first Czech player to do so.