Castlemaine may mean:
- Castlemaine, Victoria, a town in Victoria, Australia
- Castlemaine Football Club, an Australian rules football club
- Castlemaine railway station
- Castlemaine, County Kerry, a town in Ireland
- Castle Maine, a former castle in Castlemaine, County Kerry
- Castlemaine Brewery, Western Australia, ceased trading in 1927
- Castlemaine Perkins, a Queensland-based brewery, known for the XXXX range of beers
- Baron Castlemaine, in the peerage of Ireland
- Roger Palmer, 1st Earl of Castlemaine, English courtier
- Barbara Palmer, 1st Duchess of Cleveland, wife of Roger Palmer
- HMAS Castlemaine, a ship in the Royal Australian Navy
See also
- Castle Maine, in Ireland