| Saidai-ji 西大寺 | |
| Location: | 1-1-5 Saidaiji Shibachō, Nara, Nara Prefecture |
| Coordinates: | 34.6936°N 135.7795°W |
| Religious Affiliation: | Shingon Ritsu |
| Deity: | Shaka Nyorai (Śākyamuni) (Important Cultural Property) |
| Country: | Japan |
| Functional Status: | Head Temple |
| Founded By: | Jōtō and Empress Kōken |
| Established: | 765 |
| Year Completed: | 1808 (Reconstruction) |
or the "Great Western Temple" is a Buddhist temple that was once one of the powerful Seven Great Temples in the city of Nara, Nara Prefecture, Japan. The temple was first established in AD 765 as a counterpart to Tōdai-ji and it is the main temple of the sect of Buddhism after the sect's founder,, took over administration in 1238.[1] It has undergone several reconstruction efforts since then during the succeeding centuries.
One building, the Aizen-dō, houses a statue of Aizen Myō-ō, while the main image is of Shakyamuni Buddha, erected by Eison in 1249.