The 12th Mississippi Legislature met in Jackson from January 5, 1829 to February 6, 1829.

[1][2] As the incumbent lieutenant governor, A. M. Scott served as the ex officio President of the Senate.

[1] Non-senators David Gordon and Joseph Pearce were elected Clerk and Door-Keeper respectively.

[1] William L. Sharkey was elected Speaker, defeating David Cleveland in a 19-16 vote.

[2] James Cornell was elected Clerk of the House.