Jean-Jacques Lozach (French pronunciation: [ʒɑ̃ ʒak lɔzak]; born 8 February 1954) is a French politician who has represented the Creuse department in the Senate since 2008. A member of the Socialist Party, he presided over the General Council of Creuse from 2001 to 2015. Lozach previously served as Mayor of Masbaraud-Mérignat from 1986 to 1995 and Mayor of Bourganeuf from 1995 to 2001.

Lozach has served as the councillor of Creuse for the canton of Bourganeuf since 1994. He also served as a regional councillor of Limousin from 1998 to 2008, holding one of the regional council's vice presidencies during his tenure.