Namesakes
Olympic Medalists:
1 silver
(silver) Leszek Dunecki 1980 4x100 m relay 
Polish High Dukes and Kings:
2 dukes
Duke Leszek I the White 1194-1198; 1199-1202; 1206-1210; 1211-1227
Duke Leszek II the Black 1279-1288
Polish Presidents and Prime Ministers:
1 prime minister
(prime minister) Leszek Miller 2001-2004