Truman Osborn Angell (June 5, 1810 – October 16, 1887) was an American architect who served many years as the official architect of The Church of Jesus Christ of Latter-day Saints (LDS Church). The brother-in-law of Brigham Young, he was a member of the vanguard company of Mormon pioneers that entered the Salt Lake Valley on July 24, 1847.

He designed many of the great and classic buildings in Utah including:

• The Salt Lake Temple.
• The Lion House.
• The Beehive House.
• The Utah Territorial Statehouse
• The St. George Utah Temple.
• The Summit Stake Tabernacle 
• The Fort in Santaquin
• The Provo Tabernacle.
• The Council House.

Angell’s modifications to the Salt Lake Tabernacle are credited with perfecting the acoustics for which the building is famous.