| Louis Maximilian I | |
| Count of Ysenburg-Büdingen-Wächtersbach | |
| Reign: | 19 April 1798 – 23 June 1805 |
| Predecessor: | Adolph I, Count of Ysenburg-Büdingen-Wächtersbach |
| Successor: | Louis Maximilian II, Count of Ysenburg-Büdingen-Wächtersbach[1] |
| Birth Date: | 28 August 1741 |
| Birth Place: | Wächtersbach |
| Death Place: | Wächtersbach |
| House: | Isenburg |
| Issue: | Louis Maximilian II, Count of Ysenburg-Büdingen-Wächtersbach Adolph II, Count of Ysenburg-Büdingen-Wächtersbach |
| Father: | Ferdinand Maximilian II, Count of Isenburg-Wächtersbach |
| Mother: | Countess Ernestine Wilhelmine of Stolberg-Gedern |
Louis Maximilian I of Isenburg-Wächtersbach was a German count of Isenburg-Wächtersbach from 1798 to 1805. The county itself lasted from 1673 to 1806 in the central Holy Roman Empire, until it was mediated to Isenberg. He was also a descendant of Ferdinand Maximilian I of Isenburg-Wächtersbach.