I Brigade, Royal Horse Artillery (T.F.)

I Brigade, Royal Horse Artillery (Territorial Force), along with its sister II Brigade, Royal Horse Artillery (T.F.), was a horse artillery brigade of the Territorial Force that was formed in September 1914 for the 2nd Mounted Division at the start of World War I.

The brigade moved to Egypt with the division in April 1915 and remained there when the bulk of the division went to Gallipoli in August 1915. It was once more part of the 2nd Mounted Division from December 1915 but was broken up in January 1916 when the division was dissolved.