Thomas Francis Lillis (March 3, 1861 – December 29, 1938) was an American prelate of the Roman Catholic Church.

[1] His parents were both Irish immigrants; his mother was born in County Cork while his father was from County Clare and worked as a railroad contractor and later police commissioner of Kansas City under Governor Meredith Marmaduke.

[2] He attended public schools in Lafayette County before studying at Niagara University in New York, from where he obtained a Bachelor of Arts degree.

[2] At age 24, Lillis was ordained to the priesthood by Bishop John Joseph Hogan on August 15, 1885.

[4] In 1933, Lillis drafted a resolution signed by his fellow Catholic bishops in an effort to end lynchings.