Keosayan ({{lang-ar|Քեոսայան}}) is an Armenian surname that may refer to

• Edmond Keosayan (1936–1994), Armenian Soviet film director and musician
• Tigran Keosayan (born 1966), Russian-Armenian film director, actor and writer, son of Edmond

• Meanings of minor planet names: 85001–86000
• Meanings of minor planet names: 8501–9000
• Meanings of minor planet names: 86001–87000
• Meanings of minor planet names: 87001–88000
• Meanings of minor planet names: 88001–89000
• Meanings of minor planet names: 89001–90000
• Meanings of minor planet names: 90001–91000
• Meanings of minor planet names: 9001–9500
• Meanings of minor planet names: 92001–93000
• Meanings of minor planet names: 93001–94000
• Meanings of minor planet names: 95001–96000
• Meanings of minor planet names: 9501–10000
• Meanings of minor planet names: 96001–97000
• Meanings of minor planet names: 99001–100000
• Meaning/s of name Kerikeri
• Meanjin
• Mean Joe Greene
• Mean length of utterance
• Mean Life
• Mean lifetime
• Mean Lifetime
• Mean longitude
• Mean Longitude
• Mean Machine Angel
• Mean Machine (band)