Lewis Omer (August 28, 1876 – January 3, 1954) was an American football, basketball, and track coach.

He then coached track and worked in the athletic department at Northwestern University from 1911 to 1917.

[4] He joined the United States Army in 1917, reached the rank of major, and was discharged in 1921.

[4] He was also the head coach for the Carthage Red Men football team for 15 seasons, from 1921 until 1935 compiling a record of 51–52–18.

[5][6] Omer later served as a mathematics professor at Carthage.