- Robert Kimmel
- Robert King
- Robert Kingsbury
- Robert Kingsley Smith
- Robert Kinsella
- Robert Kipps
- Robert Kirby
- Robert Kirkham
- Robert Kittel
- Robert Klap
- Robert Klein
- Robert Klingler
- Robert Klug
- Robert Knauss
- Robert Knibb
- Robert Knight
- Robert Knorr
- Robert Knorrek
- Robert Koenig
- Robert Koenig
- Robert Konrad, Jr.
- Robert Korn
- Robert Korndorfer
- Robert Kornegay
- Robert Kornhaas
- Robert Korolkov
- Robert Kostow
- Robert Krueger
- Robert Kuehl
- Robert Kukuljan
- Robert Ladd
- Robert LaGanke
- Robert Lamonica
- Robert Landis
- Robert Langdon
- Robert LaPenta
- Robert LaRoche
- Robert Larsen
- Robert Latz
- Robert Lau III