Juan de Ayala | |
|---|---|
 Juan Manuel de Ayala | |
| Born | Juan Manuel de Ayala y Aranza 28 December 1745 |
| Died | 30 December 1797 (aged 52) |
| Nationality |  Spanish |
| Occupation | naval officer |
Juan Manuel de Ayala y Aranza (28 December 1745 – 30 December 1797) was a Spanish Navy officer who played a significant role in the European exploration of California, as he and the crew of his ship San Carlos were the first Europeans known to have entered the San Francisco Bay, having sailed there from the Port of San Blas, Nayarit, Mexico.