Horace Griggs Prall (March 6, 1881 – April 23, 1951) was a New Jersey attorney and Republican politician.

He served for a number of years[clarification needed] as a state legislator and a short term as acting governor of New Jersey in 1935.

Prall was born near Ringoes in East Amwell Township, New Jersey.

After almost two decades of practicing law, Prall was elected to the legislature, first to the Assembly (1927–28), then to the State Senate (1928–36), serving as president of that body in his last two years of tenure.

After completing his last term as a Senator, Prall became a judge on the Court of Common Pleas.