David Coss is an American politician and civil servant who served as mayor of Santa Fe, New Mexico from 2006 to 2014.

He was elected to a four-year term in March 2006 after serving on the Santa Fe City Council from 2002 to 2006, representing the third district.

Coss was born in Carbondale, Illinois and raised in Santa Fe, New Mexico.

Prior to his election as mayor, Coss served as director of the New Mexico Environmental Protection Division, environmental scientist for the New Mexico Environment Department, director of the Field Operations Division of the State Land Office, of Santa Fe Public Works, and city manager of the Santa Fe.

Coss is a longtime union supporter and has served in the capacities of organizer, negotiator, and president of Communications Workers of America State Government Local.