John Joseph Edward “Jack” Cassidy (March 5, 1927 – December 12, 1976) was an American actor of stage, film and screen.

His frequent professional persona was that of an urbane, super-confident egotist with a dramatic flair, much in the manner of Broadway actor Frank Fay. Cassidy perfected this character to such an extent that he was cast as the legendary John Barrymore in the feature film W.C. Fields and Me. The role of the vain, shallow, buffoon-like newsman Ted Baxter on TV's The Mary Tyler Moore Show (1970–1977) was written with Cassidy in mind. However, Cassidy turned down the role, feeling that it was not right for him, and the part went to Ted Knight. Cassidy later appeared as a guest star in a 1971 episode as Ted's highly competitive and equally egocentric brother, Hal.

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ニューヨーク州リッチモンド・ヒルで、アイルランド系の父とドイツ系の母の間に生まれる。ブロードウェイでのミュージカルを皮切りに数多くのテレビ番組や映画に出演。それからはテレビドラマに引っ切り無しにゲスト出演し『刑事コロンボ』シリーズでは3度も犯人役を務めたが、その3度目の出演となる「魔術師の幻想」が放映された1976年に、寝タバコが原因の自宅マンションの火災により49歳で死去した。遺体は損傷が激しく、歯型と指輪から本人と確認された。

John Joseph Edward „Jack“ Cassidy (* 5. März 1927 in Richmond Hill, Queens, New York City, New York; † 12. Dezember 1976 in Hollywood, Kalifornien) war ein US-amerikanischer Schauspieler und Sänger. Er war ein gefeierter Bühnenstar am New Yorker Broadway und trat auch im Fernsehen auf.