- Objective 1 region
- obsolescence
- occupational pension
- odds, fair
- OECD
- off-balance-sheet finance
- offer curve
- Office for National Statistics
- Office of Fair Trading
- Office of Management and Budget
- Office of Telecommunications
- official financing
- offshore fund
- OFT
- Oftel
- Ohlin
- oil
- oil crisis
- oil embargo
- oil price
- Okun's law
- oligopoly
- oligopsony
- OLS
- OMB
- ombudsman
- on-the-job training
- opaque policy measures
- OPEC
- open economy
