525th (Antrim) Coast Regiment, Royal Artillery (TA) was a volunteer coastal defence unit of Britain's Territorial Army from 1937 until 1956.

Originally raised in March 1937 as 188th (Antrim) Independent Heavy Battery, Royal Artillery, an independent coast defence battery with its HQ at 32 Great Victoria Street, Belfast, this was the first Territorial Army (TA) unit to be formed in Northern Ireland.

[1][2][3][a] When mobilised on the outbreak of war in September 1939 188 (Antrim) Bty was responsible for manning four 6-inch guns at the 'Defended Port of Belfast'.

From about 1953 the regiment adopted a special gilt or anodised gold collar badge consisting of the Hand of Ulster within a strap inscribed 'ANTRIM ARTILLERY', surmounted by a crown.

[2] Viscount Masserene & Ferrard, DSO, Lord Lieutenant of Antrim, was appointed Honorary Colonel of 188 Bty on 14 August 1937.