| Muss 'Em Up | |
| Director: | Charles Vidor Doran Cox (assistant) |
| Producer: | Pandro S. Berman |
| Starring: | Preston Foster Margaret Callahan Alan Mowbray Ralph Morgan |
| Music: | Roy Webb |
| Cinematography: | J. Roy Hunt Joseph August |
| Editing: | Jack Hively |
| Studio: | RKO Radio Pictures |
| Distributor: | RKO Radio Pictures |
| Runtime: | 70 minutes |
| Country: | United States |
| Language: | English |
Muss 'Em Up is a 1936 American mystery detective film directed by Charles Vidor from a screenplay by Erwin Gelsey. RKO Radio pictures premiered the film in New York City on February 1, 1936, with a nationwide opening on February 14. The film stars Preston Foster and Margaret Callahan, with a supporting cast which includes Alan Mowbray, Ralph Morgan, Big Boy Williams, and Maxie Rosenbloom.
Private detective and former police officer “Tip O’Neill” is hired by a wealthy aristocrat to solve the shooting of his dog. The intrigue continues, with kidnapping, police abuse, assault, and ransom as more characters are murdered, and betrayal within his own household leads to an unexpected conclusion.