I Brigade, Royal Horse Artillery was a brigade of the Royal Horse Artillery which existed in the early part of the 20th century. It was dissolved at the outbreak of World War I as its constituent batteries were posted to other formations.

2nd Regiment Royal Horse Artillery was a regiment of the Royal Horse Artillery that served in the Second World War. It saw action in France, Greece, North Africa and Italy. It was redesignated as 2nd Field Regiment, Royal Artillery in 1958.