| Frederick Ehlen | |
| Position: | Right fielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 12 September 1851 |
| Birth Place: | Baltimore, Maryland |
| Death Place: | Baltimore, Maryland |
| Debutdate: | April 14 |
| Debutteam: | Baltimore Marylands |
| Finaldate: | April 14 |
| Finalteam: | Baltimore Marylands |
| Stat1label: | Games played |
| Stat1value: | 1 |
| Stat2label: | At bats |
| Stat2value: | 3 |
| Stat3label: | Hits |
| Stat3value: | 0 |
| Teams: | |
Frederick Ehlen (September 12, 1851 - November 15, 1934) was a Major League Baseball right fielder who played in one game for the Baltimore Marylands on April 14, .