Quin may refer to:

• Quin (name), including a list of people with the name
• Quin, colloquially, one of a set of quintuplets, a multiple birth of five individuals
• Quin (Sigilverse), a fictional planet
• Quin, County Clare, a village in County Clare, Ireland
• QUIN, quinolinic acid, a dicarboxylic acid with a pyridine backbone
• Quin House, nickname for Algonquin Club, Boston, Massachusetts