Inga Kristina Gentzel (later Dahlgren, 24 April 1908 – 1 January 1991) was a Swedish runner who won a bronze medal in the 800 m at the 1928 Summer Olympics.

Shortly before the Olympics, she set a new world record in this event, broken two weeks later, but remained a national record until 1943.

Gentzel won the silver medal in the 1000 m at the 1926 Women's World Games.

[5] She worked as a piano teacher in Nyköping and often appeared on the Swedish radio as a member of the vocal group Trio Rita, together with Ulla Castegren and Anna-Lisa Cronström.

She was a niece of the actor Ludde Gentzel.