亚历克·吉尼斯爵士，CH，CBE（Sir Alec Guinness，1914年4月2日－2000年8月5日）是一位英国演员。他出演过伊灵制片厂的数部喜剧，包括《仁心与冠冕》，片中他分饰八个角色。之后因1957年的《桂河大桥》所扮演的尼柯逊上校一角，获奥斯卡最佳男主角奖。他还曾在《阿拉伯的劳伦斯》中饰演过费萨尔一世。晚年的著名演出，则是在《星球大战》旧三部曲中饰演欧比旺·克诺比。

Sir Alec Guinness CHCBE (2 April 1914 –5 August 2000) was an English actor. After an early career on the stage, he was featured in several of the Ealing Comedies, including The Ladykillers and Kind Hearts and Coronets in which he played eight different characters. He is also known for his six collaborations with David Lean: Herbert Pocket in Great Expectations (1946), Fagin in Oliver Twist (1948), Col. Nicholson in The Bridge on the River Kwai (1957, for which he won the Academy Award for Best Actor), Prince Faisal in Lawrence of Arabia (1962), General Yevgraf Zhivago in Doctor Zhivago (1965), and Professor Godbole in A Passage to India (1984). He is also known for his portrayal of Obi-Wan Kenobi in George Lucas's original Star Wars trilogy, receiving a nomination for an Academy Award for Best Supporting Actor.