Rillie P. Dennis (died October 8, 1955) was an American politician from Maryland.
Rillie P. Dennis was born in Newark, Maryland, to Alice and Purnell Dennis.
Dennis was a Democrat. He served as a member of the Maryland House of Delegates, representing Worcester County from 1943 to 1950.
Dennis married Dorothy. They had three sons, Walter L., Purnell V. and Billy H. He was a member of Faith Chapel in Libertytown.
Dennis died on October 8, 1955, aged 73, at his home near Berlin.