Prince consort, generally speaking, is the husband of a Queen regnant (unless he himself is a king).

Prince Consort (capitalized) is also a formal title. Prince Albert of Saxe-Coburg-Gotha is the only British prince consort to have held it, awarded to him in 1857 by his wife, Queen Victoria (reigned 1837 - 1901), in recognition of his status.

It is not entirely clear what title a prince consort would assume in the event that he were to outlive his wife, as this seems to have rarely if ever occurred in the recorded annals of monarchy. The title of Prince Bernhard of the Netherlands did not change after the death of his wife, Queen Juliana (reigned 1948 - 1980, Queen Mother 1980 - 2004).

Current examples are Prince Philip, Duke of Edinburgh (consort of Elizabeth II of the United Kingdom) and Prince Henrik of Denmark (consort of Margrethe II of Denmark).

See also: queen consort, king consort