Red Prince is a term usually applied to a prince, noble, or influential male figure with left-wing politics. The term was mostly but not exclusively used during the Cold War to refer to one of the following three princes:
Souphanouvong (1909–1995), Laotian prince and politician who served as the first President of Laos (1975-1986)
Talal ibn Abd al-Aziz (1932–2018), Saudi prince and politician who served as Minister of Communications (1952-1955) and led the Free Princes Movement (1958-1964)
Prince Moulay Hicham of Morocco (born 1964), Moroccan prince and politician
People
Patricio Lynch (1825–1886), Chilean sailor
Archduke Wilhelm of Austria (1895–1948), European soldier and activist
Scarlat Callimachi (1896–1975), Romanian journalist and activist
Krzysztof Mikołaj Radziwiłł (1898–1986), Polish politician
Abdossamad Kambakhsh (1902–1975), Iranian politician
Ali Hassan Salameh (1940–1979), Palestinian militant
Literature
The Red Prince: The Secret Lives of a Habsburg Archduke, a history book by Timothy Snyder about Archduke Wilhelm of Austria
The Red Prince, novel by A. J. Smith
Other
The Red Prince (film), a 1954 Austrian film
Red Prince (apple), an apple cultivar