Sergei Kudryavtsev may refer to:
Sergei Kudryavtsev (politician) (1903–1938), Ukrainian communist Soviet politician Sergei Kudryavtsev (diplomat) (1915–1998), Soviet intelligence officer and Soviet Ambassador to Cuba Sergey Kudryavtsev (born 1956), Russian film critic and historian Sergei Kudryavtsev (footballer) (born 1980), Russian footballer