The Shanahan surname might refer to:
- Brendan Shanahan, a Canadian hockey player
- Brendan Shanahan (author), an Australian journalist and writer
- Holly Shanahan, a New Zealand actress
- Jeremiah F. Shanahan Roman Catholic Bishop of Harrisburg, Pennsylvania
- John W. Shanahan Roman Catholic Bishop of Harrisburg, Pennsylvania
- Joseph Shanahan, a pirate who served 10 years in Sing Sing Prison
- Melanie Shanahan, an Australian folk singer and song writer
- Mike Shanahan, an American football coach currently head coach of the Washington Redskins
- Patrick Shanahan, was an Irish Fianna Fáil politician
- Patrick Shanahan (Medal of Honor), Philippine-American War Medal of Honor recipient
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