Karel Opočenský (7 February 1892 – 16 November 1975) was a Czechoslovak chess master.

[1] When World War II broke out, Opočenský, Jan Foltys, and František Zíta were playing for the Bohemia and Moravia team in the 8th Chess Olympiad in Argentina.

They chose to return home, whilst teammates Jiří Pelikán and Karel Skalička elected to remain in South America.

He also placed 13th in the Munich 1941 chess tournament (Europa Turnier), the event being won by Gösta Stoltz.

In 1942, he tied for 4–5th in Prague (Duras Jubileé) behind joint winners, Alekhine and Klaus Junge.

After the war, Opočenský played in several international and local (Czechoslovakia) tournaments.

In 1951 and 1954, he was the chief arbiter for the World Chess Championship matches in Moscow, and also in the 10th Olympiad at Helsinki 1952, and in the second Candidates Tournament at Zurich 1953.