Alvin Smith (February 11, 1798 – November 19, 1823) was the eldest brother of Joseph Smith, founder of the Latter Day Saint movement.
Alvin took a leading role in helping the Smith family work toward paying their debts and building their home.
His death at age 25 resulted in his younger brother Joseph taking more of a leading role in family affairs.
A vision claimed by Joseph Smith is said to have included Alvin's presence and played a significant role in the establishment of the Mormon doctrines of redemption of those who die without a knowledge of the gospel and baptism of the dead.