- Robert Mascioli
- Robert Masella
- Robert Massey
- Robert Mateicka
- Robert Mathias
- Robert Matthews
- Robert Matz
- Robert Maxfield
- Robert Maxwell
- Robert May
- Robert Mayn
- Robert McCall
- Robert Mccarthy
- Robert McCormack
- Robert Mccutchan
- Robert Mcdowell
- Robert McGuire
- Robert McKee
- Robert Melgaard
- Robert Melman
- Robert Melnick
- Robert Menn
- Robert Menzies
- Robert Mersten
- Robert Metzger
- Robert Meyer
- Robert Meyer
- Robert Meyers
- Robert Michalik
- Robert Migliorino
- Robert Mikesell
- Robert Milam
- Robert Millstone
- Robert Milner
- Robert Minicucci
- Robert Minion
- Robert Minter
- Robert Moir
- Robert Monk
- Robert Montgomery