Guntars Deičmans (born 4 March 1983) is a Latvian former swimmer, who specialized in individual medley events.

[1] He is a 2004 Olympian, and a multiple-time Latvian champion and record holder in the same stroke (both 200 and 400 m).

Deicmans qualified for two swimming events at the 2004 Summer Olympics in Athens, by eclipsing FINA B-standard entry times of 2:03.77 (200 m individual medley) from the FINA World Championships in Barcelona and 4:28.44 (400 m individual medley) from the European Championships in Madrid.

[4][5] In the 200 m individual medley, Deicmans challenged seven other swimmers on the fourth heat, including two-time Olympians Jeremy Knowles of the Bahamas and Ioannis Kokkodis of Greece.

He cruised to fifth place by 0.39 of a second behind Barbados' Bradley Ally, breaking a Latvian record of 2:03.68.