Deirdre Macnab (née Coulson, born December 14, 1955) is an American women's rights and voting rights activist. She is former president of the League of Women Voters of Florida (LWVFL) and is currently a member of Florida's Federal Judicial Nominating Commission. She serves as a Knight's Fellow-in-Residence at the University of Florida Bob Graham Center for Public Service and is a solar energy activist in LWVFL, acting as chairperson for their solar energy initiative.