 Steve CarellJohn du Pont | John du Pont |
 Channing TatumMark Schultz | Mark Schultz |
 Mark RuffaloDavid Schultz | David Schultz |
 Sienna MillerNancy Schultz | Nancy Schultz |
 Vanessa RedgraveJean du Pont | Jean du Pont |
 Anthony Michael HallJack | Jack |
 Guy BoydHenry Beck | Henry Beck |
 Brett RiceFred Cole | Fred Cole |
 Jackson FrazerAlexander Schultz | Alexander Schultz |
 Samara LeeDanielle Schultz | Danielle Schultz |
| FFrancis J. Murphy IIIWayne Kendall | Wayne Kendall |
 Jane MowderRosie | Rosie |
| DDavid BennettDocumentary Director | Documentary Director |
 Lee PerkinsCorporal | Corporal |
| RRobert HaramiaBanquet Guest | Banquet Guest |
 Daniel HiltRoberto Garcia | Roberto Garcia |
| BBryan CookBen Langer | Ben Langer |
| DDavid ZabriskieDan Bane | Dan Bane |
| ZZach ReyFoxcatcher Wrestler #1 | Foxcatcher Wrestler #1 |
| RReece HumphreyFoxcatcher Wrestler #2 | Foxcatcher Wrestler #2 |
| JJ.D. BergmanFoxcatcher Wrestler #3 | Foxcatcher Wrestler #3 |
| CCorey JantzenFoxcatcher Wrestler #4 | Foxcatcher Wrestler #4 |
| FFrederick FeeneySeoul Referee | Seoul Referee |
 Mark SchultzWeigh-in Official #1 | Weigh-in Official #1 |
 Lee KempWeigh-in Official #2 | Weigh-in Official #2 |
| JJake HerbertMark's Opponent at Trials | Mark's Opponent at Trials |
| DDonald ModrickFront Gate Guard | Front Gate Guard |
| GGabrielle BurtonSchool Secretary | School Secretary |
| KKevin CookePhotographer | Photographer |
| RRichard E. Chapla Jr.Broiler Hut Cashier | Broiler Hut Cashier |
