Karl Antonovich Ollo (Russian: Карл Антонович Олло) was a Russian figure skater and European silver medalist.

[1] Ollo was a three-time champion of Russia in men's single skating (in 1910, 1911, and 1912) and the 1905 bronze medalist.

[2] At the international level, he was the 1911 European Championships silver medalist.

He was coached by Nikolai Panin.

[3] He lost his life at the front in the First World War.