Grün (transliterated Gruen) is the surname of:

Austrian Green Party (Die Grünen)

Grin, Green

Alliance '90/The Greens (Bündnis 90/Die Grünen), a German party

Fred Gruen, an Australian economist, an early and influential voice in favour of free trade and tariff reductions in the 1960s and 1970s

Green Party of Switzerland (Grüne Partei der Schweiz)

Die Grünen, the name of several green parties:

Anastasius Grün, pseudonym of Anton Alexander von Auersperg (1806-1876), Austrian poet and liberal politician

Arno Gruen, German psychologist and psychoanalyst

Georges Grün, a former football defender and a TV presenter for the UEFA Champions League matches at RTL TVI

Derek Gruen, the real name of musician Del Marquis, the lead guitarist for the group Scissor Sisters

Victor Gruen (1903-1980), an Austrian-born commercial architect who emigrated to the United States in 1938 and is the father of the modern American shopping mall

Erich S. Gruen, a notable American classicist and ancient historian

Dietrich Gruen, founder of the Gruen Watch Company

Anselm Grün, a German Benedictine padre, author of spiritual books, and clerical advisor

Grün (Vogtland), a former municipality, now quarter of Lengenfeld (Vogtland)

Gruen watch, American watch company

Fall Grün, a pre-WWII German plan for an aggressive war against Czechoslovakia

Grün, the German name for the municipality Grône in the canton of Valais, Switzerland

Grün, a former village in the Landkreis Neumarkt in der Oberpfalz, Bavaria, now part of the military training field of Hohenfels

Frederick G. Gruen, son of Dietrich Gruen, player in Gruen Watch Company

Gruen transfer, in shopping mall design, the moment when consumers respond to "scripted disorientation" cues in the environment

Gruene Hall, the oldest dance hall in Texas

George J. Gruen, son of Dietrich Gruen, player in the Gruen Watch Company

Grün, the German name of the village of Zelená Lhota, part of the municipality of Nýrsko in the Czech Republic