Ocean, formerly the Astoria, is a nightclub located on Greyfriar Gate in Nottingham, England.

The building opened as a palais de danse to replace Victoria Halls in Talbot Street.

It was known as Greyfriars Hall and was opened by the Lord Mayor of Nottingham, Walter Wessen, on 8 October 1929.

[2] It was designed by the Nottingham architectural practice of Evans, Clark and Woollatt for W. A. Walker at a cost of £30,000.

[3] On 12 May 1940 three men were discovered inside the building by a police officer, and charged with breaking and entering[4] and stealing goods worth over £200 (equivalent to £13,800 in 2023).