- OAM (Operations
- OBRA 93 (Omnibus Budget Reconciliation Act of 1993)
- OCQPSK (Orthogonal Complex Quadrature Phase Shift Keying)
- OFDM (Orthogonal Frequency Division Multiplex)
- Off-Peak
- Okamura model
- OMC (Operation and Maintenance Center)
- Omni directional antenna
- On circulation
- One-and-a-half-way paging
- One-stop shop
- Open system interconnect
- Open Systems Interconnection
- Operations Support Systems (OSS)
- Operator
- Operator Service Provider (OSP)
- OQPSK (Offset Quadrature Phase Shift Keying)
- Original equipment manufacturer
- Original Equipment Manufacturer (OEM)
- Out of Band Signaling
- Output Radio Frequency Spectrum
- Over-the-Air Service Provisioning (OTASP)
- Overlay Area Code
- OVSF Orthogonal Variable Spreading Function
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