Culture or time period
- O'odham peoples936 objects
- Oakhanger2 objects
- Oceanian cultures24,059 objects
- Ocucaje Phase 7, ancient Peru (ca. 800–700 BC)720 objects
- Ocucaje style, Ica Valley720 objects
- Odawa1 objects
- Oghuz Turks1 objects
- Oglala10 objects
- Ohlone114 objects
- Ok people74 objects
- Old Akkadian (ca. 2340–2200 BC)4 objects
- Old Babylonian (ca. 1900–1600 BC)447 objects
- Old Bering Sea culture (200 BC–500 AD)1 objects
- Old Ica1 objects
- Old Kingdom (2686–2160 BC)4,955 objects
- Old World (Africa, Asia and Europe)32,888 objects
- Oldowan67 objects
- Olmec383 objects
- Olympic Peninsular cultures62 objects
- Omiri13 objects