Carl-Olof "Olle" Siggesson Nylén (30 June 1892 – 2 October 1978) was a Swedish otologist and tennis player who competed in the 1912 Summer Olympics.

In 1912, he and his partner Charles Wennergren were eliminated in the quarter-finals of the outdoor doubles.

[2][3] Nylén was born to the military doctor Sixtus Nylen (1854–1911) and Anna Choler (1862–1929).

In 1915–16, he won a few Swedish titles in singles and doubles, and in 1917, he was ranked as the best test player in Sweden.

This biographical article relating to Swedish tennis is a stub.