Horace Griggs Prall (March 6, 1881 – April 23, 1951) was a New Jersey attorney and Republican politician. He served for a number of years as a state legislator and a short term as acting governor of New Jersey in 1935. A resident of Lambertville, New Jersey, he died of a heart attack at the age of 70 on April 23, 1951, in Trenton, New Jersey.