Pavel Lychnikoff (born February 16, 1967), also credited as Pasha D. Lychnikoff, is a Russian television, film and theatre actor, who lives and works in the United States.

Pavel Lychnikoff was born in Moscow, where he eventually attended the Russian Academy of Theatre Arts (formerly known as GITIS).

In the early 1990s Lychnikoff moved to the United States. Since his subsequent move to Los Angeles, Lychnikoff has appeared in many TV-movies and -series and feature films. He is noted for his roles as the telegraph operator Blazanov in HBO's Deadwood series and as Russian mobster Vadim Youchenko in the movie Trade. He also appears as Howard Wolowitz's Russian cosmonaut crewmate on the popular TV series The Big Bang Theory.

Lychnikoff has also made several stage appearances in Russia and the U.S. His self-written play The Shelter, which he also directed, was nominated for the Californian Ovation Award in five categories, and Lychnikoff's performance in it received positive reviews from a number of critics.