| Joe Just | |
| Position: | Catcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 8 January 1916 |
| Birth Place: | Milwaukee, Wisconsin, U.S. |
| Death Place: | Franklin, Wisconsin, U.S. |
| Debutleague: | MLB |
| Debutdate: | May 13 |
| Debutyear: | 1944 |
| Debutteam: | Cincinnati Reds |
| Finalleague: | MLB |
| Finaldate: | May 13 |
| Finalyear: | 1945 |
| Finalteam: | Cincinnati Reds |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .159 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 2 |
| Teams: |
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Joseph Erwin Just (born Joseph Erwin Juszczak) (January 8, 1916 – November 22, 2003) was an American Major League Baseball catcher who broke into the Major Leagues on May 13, 1944, with the Cincinnati Reds of the National League. Just appeared in 25 games over two years with the Reds during World War II and returned to the minor leagues when the majority of players returned from military service. Later, Just managed various Milwaukee Braves minor league teams from to .