| Horace Griggs Prall | |
| Office1: | Acting Governor of New Jersey |
| Term Start1: | January 8, 1935 |
| Term End1: | January 15, 1935 |
| Predecessor1: | Clifford R. Powell (acting) |
| Successor1: | Harold G. Hoffman |
| Office2: | Member of the New Jersey Senate from Hunterdon County |
| Term Start2: | 1928 |
| Term End2: | 1937 |
| Predecessor2: | David H. Agans |
| Successor2: | Arthur F. Foran |
| Office3: | Member of the New Jersey General Assembly |
| Term Start3: | 1927 |
| Term End3: | 1928 |
| Birth Date: | 6 March 1881 |
| Birth Place: | Amwell, New Jersey, U.S. |
| Death Place: | Lambertville, New Jersey, U.S. |
| Party: | Republican |
| Alma Mater: | Harvard University New York University School of Law |
Horace Griggs Prall (March 6, 1881April 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.
Prall was born near Ringoes in East Amwell Township, New Jersey. He attended Harvard University (1906) and New York University School of Law (LL.B. 1908). 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 the resignation of Governor A. Harry Moore, Prall served as Acting Governor for a brief period (January 3, 1935 – January 15, 1935). After completing his last term as a Senator, Prall became a judge on the Court of Common Pleas.
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.[1]