1930s

After attending National Park Seminary in Washington, D.C., Lindsay convinced her parents to enroll her at the American Academy of Dramatic Arts in New York. She went abroad to England to make her stage debut. She appeared in plays such as Escape, Death Takes a Holiday, and The Romantic Age. She was often mistaken as being British due to her convincing English accent. Her fellow dramatic-school student Robert Cummings was then posing as the Englishman "Blade Stanhope Conway" and convinced Margaret Kies to follow his example and adopt a new British identity - Margaret Lindsay.

She impressed Universal Studios enough to sign her for their 1932 version of The Old Dark House. As James Robert Parish and William T. Leonard wrote in Hollywood Players: The Thirties (Arlington House, 1976), Lindsay returned to America and arrived in Hollywood, only to discover that Gloria Stuart had been cast in her role in the film. After some minor roles in Pre-Code films such as Christopher Strong and the groundbreaking Baby Face, which starred Barbara Stanwyck, Lindsay was cast in the Fox Film Corporation's award-winning Cavalcade. Lindsay was selected for a small but memorable role as Edith Harris, a doomed English bride whose honeymoon voyage takes place on the Titanic.

She won the role by backing up her British accent with an elaborate "biography" that claimed she was born in a London suburb, the daughter of a London broker who sent her to a London convent for her education. "Although I looked and talked English... to tell them I was actually from Iowa would have lost the assignment for me," she later explained.

Her work in Cavalcade earned her a contract at Warner Bros. where she became a reliable supporting player, working with Paul Muni, Errol Flynn, Henry Fonda, Warren William, Leslie Howard, George Arliss, Humphrey Bogart, Boris Karloff, and Douglas Fairbanks, Jr. Lindsay was cast four times as the love interest of James Cagney in Warner films from 1933 to 1935: Frisco Kid, Devil Dogs of the Air, G Men, and Lady Killer.

Lindsay in Public Enemy's Wife (1936)

Lindsay co-starred with Bette Davis in four Warners films: as Davis's sister in Fog Over Frisco (1934); in Dangerous (1935), for which Davis won her first Best Actress Academy Award; in Bordertown with Paul Muni, and as Davis's rival for Henry Fonda's affections in Jezebel (1938).

Glenda Farrell (left) and Lindsay (right) in The Law in Her Hands (1936)

Humphrey Bogart, Margaret Lindsay & Donald Woods in American adventure film Isle of Fury (1936)

An example of her work in a leading role in lower budget films while at Warner Bros. was The Law in Her Hands (1936), a comedy in which she played a mob lawyer. As film historian John McCarty wrote, it was "that rarity among gangster films to offer a female in the male-dominated mouthpiece role." Author Roger Dooley identified the movie as "being the only film of the 1930s to concern itself with a pair of female legal partners". Made after the Motion Picture Production Code came into effect, The Law in Her Hands was forced into adopting "a reactionary stance towards the gender switch", and concluded with a plot twist that was the complete opposite of the Pre-Code period (1929–1934), when "female characters on the screen could say, do, and be whatever they wanted."

1940s

Lindsay appeared in The House of the Seven Gables in 1940, with George Sanders and Vincent Price. Directed by Joe May from a screenplay by Lester Cole, the film's musical score by Frank Skinner was nominated for an Academy Award. Price recalled that "Margaret Lindsay was a delight to work with and a very good actress."

Michael Brunas, John Brunas, and Tom Weaver wrote in Universal Horrors: The Studio's Classic Films, 1931–46 that Lindsay "...one of the loveliest and most talented of '30s leading ladies, contributes a fine, mature performance that's probably the best, certainly the most striking, in the picture... [h]ad a Bette Davis played Hepzibah, this same performance would be hailed as a classic..."^[4]

In a 2004 Classic Images article about actor Jon Hall, film historian Colin Briggs wrote that a letter he had received from Lindsay indicated that her part in The House of the Seven Gables was her "favorite role." Lindsay's letter to Briggs also stated that the film she had the most fun with was The Vigilantes Return (1947), in which she co-starred with Jon Hall. That "role was a complete departure from my usual parts and I grabbed it...I even warbled a Mae West type ditty. As a man-chasing saloon singer after Jon Hall it was for me a totally extroverted style and I relished the opportunity...I have a framed still from that film on a wall in my home."

Lindsay with Boris Karloff in British Intelligence (1940)

Her 1940s film series work in Hollywood included Columbia's first entry in its Crime Doctor series, as well as her continuing role as Nikki Porter in Columbia's Ellery Queen series (1940–1942). Author Jon Tuska's affection for the Ellery Queen series mystified its star Ralph Bellamy. During an interview by Tuska for his 1978 book, The Detective in Hollywood, he remarked, "I'm one of the few who does [like the series]." "I don't know how...They were such quickie pictures", Bellamy replied.

Jon Tuska cited Ellery Queen, Master Detective (1940) and Ellery Queen's Penthouse Mystery (1941) as the best of the Bellamy-Lindsay pairings. "The influence of The Thin Man series was apparent in reverse," Tuska noted about Ellery Queen's Penthouse Mystery. "Ellery and Nikki are unmarried but obviously in love with each other. Probably the biggest mystery...is how Ellery ever gets a book written. Not only is Nikki attractive and perfectly willing to show off her figure...but she also likes to write her own stories on Queen's time, and gets carried away doing her own investigations", Tuska opined.

Lindsay appeared in a supporting role in the 1942 film The Spoilers, starring Marlene Dietrich and John Wayne, and in Fritz Lang's Scarlet Street (1945) with Edward G. Robinson and Joan Bennett. While her work in the late 1940s would occasionally involve a supporting role in MGM films like Cass Timberlane (1948) with Spencer Tracy and Lana Turner, her film career went into decline, with roles in films at Poverty Row studios like Monogram Pictures and PRC. She returned to the stage and co-starred with Franchot Tone in The Second Man.^[5]

1950s and 1960s

She made her television debut in 1950 in The Importance of Being Earnest, which allowed her to display her finely honed British accent. More television work followed. Lindsay appeared in only four films during the 1950s and two in the 1960s. Her final feature film was Tammy and the Doctor (1963).