Sir Isaac Heard KG (21 December [O.S. 10 December] 1730 – 29 April 1822) was a British officer of arms who served as appointed Garter Principal King of Arms, from 1784 until his death in 1822 the senior Officer of Arms of the College of Arms in London. In this role, he oversaw several notable cases and also officiated at all the funerals of the Royal family.