Marcella DiFalco
- Full Name: Marcella DiFalco
- Species: Human
- Gender: Female
- By September 2273: Chief petty officer, relief alpha shift navigator, Starfleet; USS Enterprise (Star Trek: The Motion Picture; TOS Novel: Ex Machina)
- September 30, 2273: Chief petty officer, alpha shift navigator, Starfleet; USS Enterprise (Star Trek: The Motion Picture; TOS Novel: Ex Machina)