| Lasse Dahlquist | |
| Birth Name: | Lars Erik Dahlquist |
| Birth Date: | 14 September 1910 |
| Birth Place: | Gothenburg, Sweden |
| Death Place: | Brännö, Sweden |
| Years Active: | 1928–1974 |
| Partner: | Maria Kulle |
| Children: | Bob Dahlquist |
Lars Erik ("Lasse") Dahlquist (14 September 1910 in Örgryte (grew also up in Lidingö) – died 14 October 1979 on Brännö, Gothenburg archipelago due to laryngeal cancer) was a Swedish composer, singer and actor. Many of his songs are among the most popular sing-along songs in Sweden, such as Oh boy oh boy oh boy and Gå upp och pröva dina vingar.
He was married to Inez Margareta Dahlquist, née Lindquist (1911 - 2004) from 1936 and they had a son; the saxophonist Robert "Bob" Dahlquist (2 September 1938 – 6 September 2005). On Saltholmen, at the terminal of the boats of Styrsöbolaget, there is a place called Lasse Dahlquists Plats.
As a child, he spent his summers at his grandfather's farm, Langegården, on Brännö where he built his own home as well. He worked at Sven-Olof Sandberg's music publishment Svenska Noter and in 1931 he began recording gramophone records.
In 1977 he received the Evert Taube award.