Henry McMahon may refer to:
- Henry McMahon (diplomat)Henry McMahon (diplomat)Lieutenant-Colonel Sir Arthur Henry McMahon, GCMG, GCVO, KCIE, CSI was a British diplomat and Indian Army officer who served as the High Commissioner in Egypt from 1915 to 1917. He was also an administrator in British India, and served twice as Chief Commissioner of Balochistan...
(1862–1949), diplomat known for the McMahon Line and the McMahon-Hussein Correspondence
- Henry McMahon (musician), member of the band Big Tom and The Mainliners
- A fictional character in the 1997 book Term Limits by Vince Flynn