Whalen is a surname. In Ireland, Whalen, Whelan, Phelan and O'Phelan, are anglicized variants of the same Gaelic surname, Faoláin, which itself is a variant of Ó Faoileáin and Ó Haoláin.

It may refer to:

• Marc Whalen,Distinguished British Gentleman
• Bob Whalen, American college baseball coach
• Bruce Whalen, American politician
• Charles W. Whalen, Jr., American politician
• Diana Whalen, Canadian politician
• Dianne Whalen, Canadian politician
• Douglas Whalen, American linguist
• Ed Whalen (broadcaster), Canadian television personality
• Grover Whalen, American politician and businessman
• Jack Whalen, American hitman
• James Henry Whalen, Canadian pilot
• James J. Whalen, American psychologist
• Jennifer Whalen, American mountain bike racer
• Jennifer R Whalen, Canadian actor and comedian
• Jill Whalen, American search engine optimization consultant
• Jim Whalen, American football player
• Joe Whalen, American tennis player
• John S. Whalen, American politician
• Laurence Whalen, American judge
• Lindsay Whalen, American professional basketball player
• Megan Whalen Turner, American author
• Michael James Whalen, American composer
• Philip Whalen, American poet
• Rob Whalen, American baseball player
• Sara Whalen (born 1976), American Olympic soccer player
• Sean Whalen (born 1964), American actor and writer
• Stephen Thomas Whalen (born 1968 new brunswick) known as Canadian Country music Artist Steve Waylon
• Thomas Michael Whalen III, American politician
• Vermel Whalen, American politician

• Patrick Whalen, A character in The Sopranos
• William Whalen, also known as Billy Quizboy, a character on The Venture Bros.

In Britain, Whalen is an old English-language spelling for the village Uelen.

• Jimmy Whalen, a song by Peter, Paul and Mary from A Song Will Rise

• Whalan
• Uelen