Pert L. Kelton (October 14, 1907 – October 30, 1968) was an American stage, movie, radio, and television actress. She was the original Alice Kramden in The Honeymooners with Jackie Gleason. During the 1930s, she was a prominent comedic supporting and leading actress in Hollywood films such as Gregory La Cava's Bed of Roses with Constance Bennett and Raoul Walsh's The Bowery with Wallace Beery and George Raft (both released in 1933). She performed in a dozen Broadway productions between 1925 and 1968. She is probably best known for creating the role of Mrs. Paroo in the original 1957 Broadway production of the musical The Music Man, which she reprised in the 1962 movie adaptation. In the early 1950s, her career was interrupted as a result of Hollywood blacklisting, leading to her departure from The Honeymooners.

Pert L. Kelton was born in 1907 in Great Falls, Montana. Her mother, Sue Kelton, was a native of Canada; her father, Edward Kelton, a native of California.

Kelton was reportedly named by her aunt, who suggested the name "Pert" to her mother after her favorite theatrical role, the character "Pert Barlow" in a play called Checkers.

In 1910, while accompanying her parents and sister on an overseas tour of shows, she debuted on stage at the age of three in Cape Town, Union of South Africa.

Upon her return to the United States with her family, Kelton was enrolled in private schools for her early formal education and for extensive training in dance, voice, and drama. By age 12, after appearing for a while with her parents as "The Three Keltons", she began appearing as a solo act or "single" in vaudeville; and by age 17 she was performing on Broadway, initially as a cast member in Jerome Kern's 1925 musical comedy Sunny, starring Marilyn Miller.

Kelton and her parents had moved to California to work in Hollywood films by the latter half of 1927. Her first credited movie role there was as Rosie in First National Pictures' 1929 release Sally, based on the Broadway hit by the same name. The federal census of 1930 showed that Kelton was living in Los Angeles at the Warner-Kelton Hotel – later called the Hotel Brevoort (and Tropical Gardens) – sharing room 666. That same census identifies all three of the Keltons as employed actors in "motion pictures".

Kelton was a young comedienne in A-list movies during the 1930s, often portraying the leading lady's wisecracking friend. She had a memorable turn in 1933 as dance hall singer "Trixie" in The Bowery alongside Wallace Beery, George Raft, Jackie Cooper, and Fay Wray. Directed by Raoul Walsh, the film is based on the story of Steve Brodie, the first man who reportedly jumped off the Brooklyn Bridge in 1886 and lived to brag about it. Kelton at one point in the film sings to a rowdy, appreciative crowd in an energetic dive, using a curious New York accent to good comedic effect, with Beery and Raft arguing afterwards over her attentions.

In Gregory LaCava's 1933 pre-Code comedy Bed of Roses, Kelton plays Minnie, a witty prostitute who is a partner in crime with Lorry, portrayed by Constance Bennett. The two women in the plot are fond of getting admiring men helplessly drunk before robbing them, at least until getting caught and tossed into jail. Kelton has all the best lines, surprisingly wicked and amusing observations that would never be allowed in an American film after the Hollywood Production Code was adopted. Nevertheless, in 1933 her performance in Bed of Roses was widely praised by critics in leading newspapers and trade papers.