| Ham Hyatt | |
| Position: | First baseman / Outfielder |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | 1 November 1884 |
| Birth Place: | Buncombe County, North Carolina, U.S. |
| Death Place: | Liberty Lake, Washington, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 15 |
| Debutyear: | 1909 |
| Debutteam: | Pittsburgh Pirates |
| Finalleague: | MLB |
| Finaldate: | September 2 |
| Finalyear: | 1918 |
| Finalteam: | New York Yankees |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .267 |
| Stat2label: | Home runs |
| Stat2value: | 10 |
| Stat3label: | Runs batted in |
| Stat3value: | 146 |
| Teams: | |
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Robert Hamilton Hyatt (November 1, 1884 – September 11, 1963) was an American professional baseball first baseman. He played in Major League Baseball (MLB) from 1909 to 1918 for the Pittsburgh Pirates, St. Louis Cardinals, and New York Yankees.
Hyatt started his professional baseball career with the Vancouver Beavers of the Northwestern League. In 1908, he hit .323 with 15 home runs; he led the league in hits, home runs, and runs scored.[1] He was purchased by the Pittsburgh Pirates after the season.
From to, Hyatt served mostly as a pinch hitter for the Pirates; Steve Treder of The Hardball Times credits him as baseball's first pinch-hitting specialist. His 181 OPS+ in is the highest for a single season of any player deployed in this role.[2] Hyatt also had one-year stints playing for the St. Louis Cardinals and the New York Yankees.[3] After his time in the major leagues ended, Hyatt played in the minors. He spent – with the Pacific Coast League's Vernon Tigers, hitting over .300 each year.[1]