But most individuals outside the LDS faith would incorrectly consider it to be the inaugural temple of The Church of Jesus Christ of Latter-day Saints.
Not only is the Salt Lake Temple not the oldest in LDS history, it's not even the oldest in Utah.
The first LDS temple was built and dedicated in 1836 in Kirtland, Ohio. The edifice, used for meetings and instruction rather than the type of ordinances currently performed by temple patrons, still stands, but it is no longer owned by the church.
The original Nauvoo Temple was completed in 1846, two years after the martyrdom of church founder Joseph Smith and shortly before the Latter-day Saints were forced from the city and began their exodus to the Salt Lake Valley. It was destroyed by arson.
The Salt Lake Temple was the first temple started in Utah Territory, with construction beginning in 1853. But three other temples were finished before the April 6, 1893, dedication date — in St. George (1877), Logan (1884) and Manti (1888).