| Elsa Wallenberg | |
| Birth Date: | 26 January 1877 |
| Birth Place: | Viby, Hallsberg, Sweden |
| Death Place: | Stockholm, Sweden |
| Othertournaments: | yes |
| Olympicsresult: | F (1908) |
Elsa Wallenberg (née Lilliehöök, 26 January 1877 – 17 October 1951) was a Swedish tennis player who competed in the indoor singles event at the 1908 Summer Olympics.[1] She reached the final in which she lost to eventual Olympic champions Gwendoline Eastlake-Smith. In the bronze medal match Wallenberg lost to compatriot Märtha Adlerstråhle.
She was married to Axel Wallenberg (1874-1963). They were the parents of Gustaf Wally.