2O

2O or 2-O may refer to:

• 2o Sector, see Secondary sector of the economy
• 2'-O-methylation
• 2O, IATA code for Island Air Service in Alaska; see Essential Air Service

See also

• 2OOO, a Sydney, Australia radio station
• O2 (disambiguation)
• H2O (Molecule)
• J20 (disambiguation)
• L20 (disambiguation)
• N2O (disambiguation)
• 20
• 2O (Atom)
• 2Q (disambiguation)