| Donald Eppes | |
|---|---|
| Numb3rs character | |
 Rob Morrow as Don Eppes in a promotional photo for Numb3rs. | |
| First appearance | "Pilot" |
| Last appearance | "Cause and Effect" |
| Portrayed by | Rob Morrow |
| In-universe information | |
| Gender | Male |
| Occupation | FBI Special Agent |
| Family | Alan Eppes (father) Charlie Eppes (brother) Margaret Mann-Eppes (mother, deceased) Amita Ramanujan (sister-in-law) |
| Significant other | Robin Brooks (fiancée) |
Donald "Don" Eppes is a fictional character and one of the protagonists of the CBS crime drama Numbers. He is portrayed by Rob Morrow.
Don is an FBI Special Agent who runs the FBI Violent Crimes Squad in Los Angeles. Don recruits his mathematical genius brother, Charlie Eppes, to help him and the Bureau solve some of their most difficult cases. Don makes great sacrifices in his personal life in order to devote himself to his career, which to him is more of a way of life than a mere job. More important to him than his work is his family, especially Charlie, even though he doesn't understand his brother's way of looking at the world.