- Mike and Bob Brannagan (The Brothers Brannagan) by Wilbur Stark & Jerry Layton
- Leander and Horatio Jones by Maxwell Hawkins
- Jerry (and Danny) Nelson by Howard Schoenfeld
- Rick and A.J. Simon (Simon & Simon)
- Tony and Shep Thomas (Twin Detectives) by Robert Carrington, Robert Specht & Everett Chambers
- Four Eyes: Twin Private Detectives
A (very short) list of twin P.I.s.
Respectfully compiled by Kevin Burton Smith.