Gunnar Isidor Sundman (15 April 1893 – 20 July 1946) was a Swedish swimmer.

[1] He competed at the 1912 Summer Olympics in the 100 m backstroke event, but failed to reach the final.

[2][3] Sundman later immigrated to the United States, where he continued to swim and worked as an engineer with the California Department of Transportation.

He served in World War I.

[2][3] This biographical article related to a Swedish swimmer is a stub.