Alexander G. Clark (February 25, 1826 – May 31, 1891) was an African-American businessman and activist who served as United States Ambassador to Liberia in 1890–1891, where he died in office.

In 1867 Clark sued to gain admission for his daughter to attend a local public school in Muscatine, Iowa.

He was a prominent leader in winning a state constitutional amendment that gained the right for African Americans in Iowa to vote (1868).

[2] In May 1842 at age 16 Clark settled in Muscatine, Iowa (then known as Bloomington), the Mississippi River town where he made his life.

[2] He worked as a barber and became an entrepreneur, acquiring real estate and selling timber as firewood to the steamboats that frequented the Mississippi River.

The AME church was the first independent black denomination in the United States, founded in Philadelphia, Pennsylvania in the early 19th century.

"[5] Despite being a small minority in the state, by war's end, a total of nearly 1,100 blacks from Iowa and Missouri served in the regiment.

[5] Clark enlisted at age 37 and was ranked as sergeant-major, but he could not muster due to a physical defect, perhaps in his left ankle.

[3] Clark pressed for improving civil rights for African Americans in Iowa, as well as related issues on a national level.

After the Civil War, Clark and African-American veterans pressed the Iowa legislature for the right to vote, gaining that in an 1868 constitutional amendment.

The court ruled that requiring Black students to attend a separate school and denying them of a quality education violated the law which "expressly gives the same rights to all the youths.

After the Civil War, Clark became increasingly politically active in the Republican Party and in Prince Hall Freemasonry, a growing fraternal organization.

[1] In 1873 President Grant offered him an appointment as consul to Aux Cayes, Haiti, but he declined the position[3] as he thought the pay was too low.