Yi Kang-guk (Korean: 이강국; Hanja: 李康國; 7 February 1906 – 1955) was a communist politician in the early years of the Democratic People's Republic of Korea.

During his studies at Humboldt University of Berlin, he joined the German Communist Party, where he returned to Korea in 1935 and was imprisoned in a labor camp in Wonsan, South Hamgyong Province.

Kim Soo-im, famous for his spying, was living under the premise of marrying Colonel Baird, a US military police officer at the time, and was accompanied by Lee Kang-guk in the commander's car, which was driven by the US military police, so that they could avoid the 38th parallel.

In November 1951, he served as President of the Ministry of Trade's General Products Import Corporation,[3] and Joso Airlines.

Around the end of the Korean War, together with Ri Sung-yop, Cho Il-myung (조일명), and Im Hwa (임화) he was arrested on suspicion of overthrowing the government, political terror and being U.S spies, and was purged in 1953.