Ronald Colman and his wife, Benita as themselves - They were among Benny's most popular guest stars on the radio series, portraying his long-suffering next-door neighbors.
On the show, the Colmans were often revolted by Jack's eccentricities and by the fact that he always borrowed odds and ends from them (at one point, leading Ronald to exclaim, "Butter?
Butter, butter!!!
 Where does he think this is, Shangri-La?").
Dennis Day often impersonated Ronald Colman.

Frank Parker was the show's singer during the early seasons on radio from New York.

Kenny Baker – The show's tenor singer, he originally played the young, dopey character.
He was replaced by Dennis Day.

Andy Devine – Jack's raspy-voiced friend, he lived on a farm with his ma and pa.
He usually told a story about his folks and life around the farm.
His catchphrase was "Hiya, Buck!"

Sam Hearn as Schlepperman - A Jewish character, he spoke with a Yiddish accent (his catch phrase: "Hullo, Stranger!").
He would return again as the "Hiya, Rube!"
guy, a hick farmer from the town of Calabasas, who always insisted on referring to Jack as "rube".

Ed Beloin as Mr. Billingsley - He was Benny's polite but eccentric boarder.
He appeared in the early 1940s.

Larry Stevens – A tenor singer, he substituted for Dennis Day from November 1944 to March 1946, when Dennis served in the Navy.

Mary Kelly  as the Blue Fairy - A clumsy, overweight fairy, she appeared in several storytelling episodes.
Kelly had been an old flame of Jack's, who had fallen on hard times.
Benny was unsure of whether to give Kelly a regular role and instead appealed to friend George Burns, who put her on his show in 1939 as Mary "Bubbles" Kelly, best friend to Gracie.

Gisele MacKenzie – A singer and violin player, she guest-starred seven times on the program.

Blanche Stewart  contributed a variety of characters and animal sounds.

Barry Gordon  played Jack Benny as a child in a skit where Jack played his own father.

Johnny Green was the band leader until 1936, when Phil Harris joined the show.
Ronald Colman and his wife, Benita as themselves - They were among Benny's most popular guest stars on the radio series, portraying his long-suffering next-door neighbors. On the show, the Colmans were often revolted by Jack's eccentricities and by the fact that he always borrowed odds and ends from them (at one point, leading Ronald to exclaim, "Butter? Butter, butter!!!  Where does he think this is, Shangri-La?"). Dennis Day often impersonated Ronald Colman.
Frank Parker was the show's singer during the early seasons on radio from New York.
Kenny Baker – The show's tenor singer, he originally played the young, dopey character. He was replaced by Dennis Day.
Andy Devine – Jack's raspy-voiced friend, he lived on a farm with his ma and pa. He usually told a story about his folks and life around the farm. His catchphrase was "Hiya, Buck!"
Sam Hearn as Schlepperman - A Jewish character, he spoke with a Yiddish accent (his catch phrase: "Hullo, Stranger!"). He would return again as the "Hiya, Rube!" guy, a hick farmer from the town of Calabasas, who always insisted on referring to Jack as "rube".
Ed Beloin as Mr. Billingsley - He was Benny's polite but eccentric boarder. He appeared in the early 1940s.
Larry Stevens – A tenor singer, he substituted for Dennis Day from November 1944 to March 1946, when Dennis served in the Navy.
Mary Kelly  as the Blue Fairy - A clumsy, overweight fairy, she appeared in several storytelling episodes. Kelly had been an old flame of Jack's, who had fallen on hard times. Benny was unsure of whether to give Kelly a regular role and instead appealed to friend George Burns, who put her on his show in 1939 as Mary "Bubbles" Kelly, best friend to Gracie.
Gisele MacKenzie – A singer and violin player, she guest-starred seven times on the program.
Blanche Stewart  contributed a variety of characters and animal sounds.
Barry Gordon  played Jack Benny as a child in a skit where Jack played his own father.
Johnny Green was the band leader until 1936, when Phil Harris joined the show.
The Jack Benny Program