Cho Sonjin (Korean: 조선진; born April 18, 1970) is a professional Go player.

Cho was born in South Korea, but moved to Japan at age 12 in order to become a professional.

He accomplished his goal two years later in 1984.

In 1999, he defeated Cho Chikun in the Honinbo, ending Chikun's 10-year run with the title.

This biographical article relating to a South Korean Go figure is a stub.