| Actor | Character | Firearm | Notes |
|---|---|---|---|
| Carlos Gómez | Miguel Escobar | Colt MK IV Series 80 Combat Commander | "Mr. Monk Gets Jury Duty" (S4E16) |
| Emmanuelle Vaugier | Pat | Colt Model 1908 Vest Pocket | "Mr. Monk Gets Jury Duty" (S4E16) |
| Emmanuelle Vaugier | Pat | Beretta 92FS | "Mr. Monk Gets Jury Duty" (S4E16) |
| Kevin Kilner | Jack Bollinger | Colt M1911 | "Mr. Monk and Mrs. Monk" (S04E06) |
| Ted Levine | Capt. Leland Stottlemeyer | Smith & Wesson 3913 | - |