IV Brigade, Royal Horse Artillery was a brigade of the Royal Horse Artillery which existed in the early part of the 20th century. It served with 3rd Cavalry Division throughout World War I but was dissolved shortly thereafter. The successor unit, 4th Regiment, RHA, was formed in 1939 and still exists as 4th Regiment Royal Artillery. The brigade had an earlier incarnation as D Brigade, Royal Horse Artillery, formed from the Horse Artillery Brigade of the Honourable East India Company's Madras Army in 1862 before being broken up in 1877.