Pro

PRO or Pro may refer to:

Language

Professional, abbreviation
- e.g. many products are marketed described as Pro (or Professional), implying superiority
PRO (linguistics) ("big PRO"), an empty category occupying the subject position in non-finite clauses
pro (linguistics) ("little pro"), an empty category taking the place of a subject pronoun in pro-drop languages

Proline, an amino acid
Pressure-retarded osmosis, separation of a solvent from a pressurised and concentrated solution
PRO (category theory), a construction in mathematics
Patient-reported outcome, in clinical trials
.pro, a generic top-level Internet DNS domain
Pro theme, a visual style designed for professional-grade software for Mac OS X
pro-, a suffix used in taxonomy

Partido Progresista de Chile, (Progressive Party), known as PRO, a political party in Chile
Pasadena Roof Orchestra, a contemporary band from England
Pensionärernas riksorganisation, the Swedish National Pensioners’ Organisation
Performance rights organisation
Producer Responsibility Organisation
Professional Referee Organization, the referee program in professional soccer leagues in the United States and Canada
Propuesta Republicana (Republican Proposal), known as PRO, a political party in Argentina
Provincial Research Organization, a Canadian applied-research organisation
Public Record Office, predecessor of the UK National Archives
Partei Rechtsstaatlicher Offensive (Party for a Rule of Law Offensive), a former political party in Germany