What does ULO stand for?

Occupational Safety and Health Administration, Technical Data Center, Washington, DC - OCLC symbol (OCLC)

Unilateral Ovariectomy - Gynecology

United Labour Organization - Burma

United Licensed Officers (SAUS)

Unit Landing Officer (SAUS)

Unmanned Launch Operations - NASA (KSC)

Unmanned Lunar Orbiter - NASA (MCD)

Unrestricted Line Officer - Navy (DNAB)