A vehicular exterior rearview mirror assembly includes a mirror head and a mounting base configured for attachment at a side of a vehicle. The mirror head includes a mirror casing and a reflective element. The vehicular exterior rearview mirror assembly includes a turn signal indicator. The turn signal indicator, with the mounting base of the vehicular exterior rearview mirror assembly attached at the side of the vehicle, and responsive to actuation by a driver of the vehicle of a turn signal of the vehicle, projects a turn signal icon onto the ground proximate the side of the vehicle. The turn signal indicator may be disposed at a lower region of the mirror casing and may intermittently project a direction-indicating icon or shape onto the ground, with the direction-indicating shape indicating a direction away from the side of the vehicle.