Placenames
- Germany
- Nassau, Germany, a town in Rhineland-Palatinate founded in AD 915, after which all the following (except the village in Saxony) are named, directly or indirectly
- Nassau Castle, ancestral seat of the House of Nassau
- Nassau (state), German state within the Holy Roman Empire
- Hesse-Nassau, Prussian province formed by annexation of the Duchy of Nassau
- Nassau, Saxony, a village in the Ore Mountains
- Bahamas
- Nassau, Bahamas, capital city of the Bahamas, on the island of New Providence
- Canada
- Nassau District, renamed Home District, regional division in Upper Canada from 1788 to 1792
- Nassau Street (Winnipeg), Manitoba
- Cook Islands
- Nassau (Cook Islands): one of the Northern Cook Islands
- Indonesia
- Sudirman Range, aka Nassau Range: one of the names of the highest mountain range in Indonesia
- Nassau, North Sumatra, a subdistrict in Toba Samosir Regency, North Sumatra
- Ireland
- Nassau Street (Dublin)
- Netherlands
- Baarle-Nassau, a town in the southern Netherlands
- United States
- Nassau, Delaware
- Nassau, Minnesota
- Nassau (town), New York
- Nassau (village), New York
- East Nassau, New York
- Nassau Bay, Texas
- Nassau County, Florida
- Nassau County, New York
- Nassau Fjord, a fjord in Prince William Sound, Alaska
- Nassau Street (Princeton), New Jersey
- Nassau Street (Manhattan), New York
- Nassau Village-Ratliff, Florida
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