William Brooks Alexander Jr. (December 23, 1921 - January 19, 2006) was an American attorney, farmer, and politician.

He was a member of the Mississippi State Senate from 1960 to 1984, and its president pro tempore from 1976 to 1984.

William Brooks Alexander was born on December 23, 1921, in Boyle, Mississippi.

[1][2] He was the son of lawyer and state senator William Brooks Alexander Sr. and Vivien B.

[2] He was first elected to the Mississippi State Senate in 1960 after the death of his father, who had been the incumbent.