SOS2 may refer to:

• Son of Sevenless, a set of encoding genes
• Special ordered set of type 2, a structure in discrete optimization

• Conleth Gilligan
• Conley (disambiguation)
• Conley Elementary School
• Conley House
• Conley index
• Conley index theory
• Conley's Ford Bridge
• Conley Terminal
• Conley Township
• Conley Township, Holt County, Nebraska
• Conley Township, Nebraska
• Conley v. Gibson
• Con-Lib coalition
• Conlie
• Conlie Camp
• Conliege
• Conliège
• Con Lo Que Cuenta Este Pais
• Con los anos que me quedan
• Con Los Años Que Me Quedan
• Conluvio: The Art of Ben Templesmith, Vol. 2
• Conly
• Conly (disambiguation)
• Conmac
• Conmacne