Mari Doi (土井 真理, Doi Mari, November 11) is a Japanese voice actress from Oita Prefecture. She is affiliated with EARLY WING.

On March 31, 2025, following the suspension of Office PAC’s operations on the same day, she transferred to EARLY WING effective April 1. Her special skills and hobbies include Japanese classical dance, kyōgen (traditional comic theater), and playing the flute.