Mary Jane Croft (February 15, 1916 – August 24, 1999) was an American actress best known for roles as Betty Ramsey on I Love Lucy, Miss Daisy Enright on the radio and television versions of Our Miss Brooks, Mary Jane Lewis on The Lucy Show and Here's Lucy, and Clara Randolph on The Adventures of Ozzie and Harriet. Croft's initial appearance on radio was in Sherlock Holmes. She worked extensively as an actress in radio, appearing on such programs as Life with Luigi, Blondie, The Adventures of Sam Spade, Suspense, The Beulah Show, The Bill Goodwin Show, Broadway Is My Beat, On Stage, Crime Classics, Four-Star Playhouse, The Harold Peary Show, Joan Davis Time, The Mel Blanc Show, One Man's Family, Our Miss Brooks, and Sears Radio Theater. She also appeared in frequent guest-star roles on Lucille Ball's My Favorite Husband, the beginning of their later professional and personal relationship.