粉红三角形（德文：Rosa Winkel）是纳粹集中营臂章之一，用于识别男囚犯被捕的原因为同性恋。在集中营中，每名囚犯都必须佩戴一个倒转的臂章以区别其所属的「类别」。臂章的图形可以重叠，以表示其属于双重类别。比如一名犹太裔男同性恋者，将会佩戴一个粉红色和黄色的三角臂章。

最初，同性恋者的惩罚是去势（切去男性性器官），后来变成了死刑。虽然在集中营中被杀害的同性恋者难以有精确的统计，但是根据Richard Plant的估算，大约有50,000到63,000名男同性恋者在1933年至1944年间被纳粹收监。

The pink triangle (German:Rosa Winkel) was one of the Nazi concentration camp badges, used to identify male prisoners who were sent there because of their homosexuality. The pink triangle was also used to identify sexual offenders including rapists, paedophiles and zoophiles. Every prisoner had to wear a downward-pointing triangle on his or her jacket, the colour of which was to categorise him or her by "kind". Other colors identified Jews (two triangles superimposed as a yellow star), political prisoners, Jehovah's Witnesses, "anti-social" prisoners, and others the Nazis deemed undesirable. Pink and yellow triangles could be combined if a prisoner was deemed to be gay and Jewish.