| Joe Giannini | |
| Position: | Shortstop |
| Birth Date: | 8 September 1888 |
| Birth Place: | Drytown, California |
| Death Place: | San Francisco, California |
| Bats: | Left |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | August 7 |
| Debutyear: | 1911 |
| Debutteam: | Boston Red Sox |
| Finalleague: | MLB |
| Finaldate: | August 7 |
| Finalyear: | 1911 |
| Finalteam: | Boston Red Sox |
| Statleague: | MLB |
| Stat1label: | Batting Average |
| Stat1value: | .500 |
| Stat2label: | Home Runs |
| Stat2value: | 0 |
| Stat3label: | RBI |
| Stat3value: | 0 |
| Teams: |
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Joseph Francis Giannini (September 8, 1888 – September 26, 1942) was a shortstop in Major League Baseball who played briefly for the Boston Red Sox during the season. Listed at, 155 lb., Giannini batted left-handed and threw right-handed. A native of Drytown, California, he was signed by Boston out of the University of San Francisco.
Giannini was a major leaguer whose career, statistically speaking, was only slightly different from that of Eddie Gaedel or Moonlight Graham. He appeared in one game and hit a double in two at-bats for a .500 average, without runs or RBI. As a fielder, he collected two assists and committed two errors for a .909 fielding percentage. Giannini died in San Francisco, California, at age 54.