Lucien Baker (June 8, 1846 – June 21, 1907) was a United States senator from Kansas.

Lucien Baker
United States Senator from Kansas
In office March 4, 1895 – March 3, 1901
Preceded by	John Martin
Succeeded by	Joseph R. Burton
Member of the Kansas Senate from the 3rd district
In office 1893-1895
Preceded by	Ira F. Collins
Succeeded by	Percival Lowe
Personal details
Born	(1846-06-08)June 8, 1846 Cleveland, Ohio
Died	June 21, 1907(1907-06-21) (aged 61) Leavenworth, Kansas
Political party	Republican
Alma mater	University of Michigan Law School

Baker was born near Cleveland, Ohio and moved with his parents to Morenci, Michigan. There he attended public schools and graduated from Adrian College and from the law department of the University of Michigan at Ann Arbor.

He was admitted to the bar in 1868 and commenced practice in Leavenworth, Kansas in 1869. From 1872 to 1874, he was a city attorney of Leavenworth.

From 1893 to 1895, he was a member of the State Senate and was elected as a Republican to the United States Senate. He served from March 4, 1895 to March 3, 1901 but was an unsuccessful candidate for renomination. He was the chairman of the Committee on Civil Service and Retrenchment (Fifty-sixth Congress)

Afterward his term in the Senate, he resumed the practice of law in Leavenworth, where he died on June 21, 1907; he is interred in Mount Muncie Cemetery.

He was the brother of John Baker.