The 1st Royal Naval Brigade was an infantry brigade of the Royal Navy. It was assigned to the 63rd (Royal Naval) Division and served on the Western Front during the First World War. The brigade was raised in August 1914, from surplus naval reserves. By April 1915, it was known as 1st (Royal Naval) Brigade, but was re-designated as 1st Brigade on 2 August 1915. The Brigade was broken up on 2 July 1916, the staff joining the 3rd (Royal Marine) Brigade.