OLA may stand for:

• United Nations Office of Legal Affairs
• Official Languages Act 2003, Ireland
• Oklahoma Library Association
• Online authorisation
• Ontario Lacrosse Association
• Ontario Legislative Assembly
• Ontario Library Association
• Open Learning Agency, British Columbia, Canada
• Operational-level agreement in support of a service-level agreement
• WebSphere Optimized Local Adapters, IBM software
• Oregon Library Association
• Oromo Liberation Army, armed opposition group in Ethiopia and former armed wing of the OLF
• Ostseeland Verkehrs Gmbh, a Transdev Germany railway
• Our Lady of the Abandoned Parish Church (Marikina), Philippines
• Overlap–add method in signal processing
• Overland Airways, ICAO airline code OLA
• OLA Girls Senior High School (Ho), Ghana
• OLA Girls Senior High School (Kenyasi), Ghana