Kiernan is a surname, of Irish origin, and may refer to:
- Ben Kiernan
- Caitlin R. Kiernan
- Colm Kiernan
- Ford Kiernan
- Francis Kiernan
- Ian Kiernan
- Jerry Kiernan
- John J. Kiernan (1847–1893), New York financial news pioneer and politician
- Kitty Kiernan
- Mike Kiernan
- Pat Kiernan
- Tom Kiernan
- Victor Kiernan
- Walter Kiernan
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