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.

[2][3] She was married to Axel Wallenberg (1874-1963).

This biographical article relating to Swedish tennis is a stub.