A person authorized of God to see with spiritual eyes things that God has hidden from the world (Moses 6:35–38). He is a revelator and a prophet (Mosiah 8:13–16). In the Book of Mormon, Ammon taught that only a seer could use special interpreters, or a Urim and Thummim (Mosiah 8:13; 28:16). A seer knows the past, present, and future. Anciently, a prophet was often called a seer (1 Sam. 9:9; 2 Sam. 24:11).
Joseph Smith is the great seer of the latter days (D&C 21:1; 135:3). In addition, the First Presidency and the Council of the Twelve are sustained as prophets, seers, and revelators.