Formal or informal associations of human beings, usually in pursuit of some common goal
- Dansk Libertarisk Parti - Danish libertarian political party
- Delaware, Libertarian Party of
- Democratic Freedom Caucus - Promotes individual liberty and limited government in the Democratic Party
- Democratic Party - United States
- Denton County Texas, Libertarian Party of - Texas
- Denver Affiliate, Libertarian Party - Colorado
- District of Columbia, Libertarian Party of the
- Duval County, Libertarian Party of - Florida