KRR may refer to:

FK Jūrnieks, a Latvian football club, known as KRR from 1964 to 1968 Kallio Rolling Rainbow, a Finnish roller derby league Kiamichi Railroad, reporting mark Kirkintilloch Rob Roy, a Scottish football club in the West of Scotland Football League Krasnodar International Airport, North Caucasus, Russia, IATA Code Kommissarische Reichsregierung, a German political movement K. R. Ramasamy (actor) (1914–1971), Indian actor and singer in Tamil cinema Knowledge representation and reasoning in artificial intelligence KR Reykjavík, an association football club in Iceland.

See also KRR1, a protein