At Last the 1948 Show is a satirical television show made by David Frost's company, Paradine Productions (although it was not credited on the programmes), in association with Rediffusion London. Transmitted on Britain's ITV network in 1967, it brought Cambridge Footlights humour to a broader audience.

The show starred and was written by Tim Brooke-Taylor, Graham Chapman, John Cleese, and Marty Feldman. Cleese and Brooke-Taylor were also the programme editors. Aimi MacDonald (usually billed as "the lovely Aimi MacDonald") was the cheerfully ditsy host who introduced the show and also appeared in occasional (and brief) in-show linking segments, but she did not appear in sketches. The director was Ian Fordyce. Chapman and Cleese would later be among the founders of the Monty Python comedy troupe, and several of the sketches first performed in At Last the 1948 Show would later be performed by Monty Python in various formats. Cleese and Chapman's future Python partner Eric Idle appears as a bit part player in a few sketches; similarly, Brooke-Taylor's future Goodies partner Bill Oddie appears in some small roles.

While only two episodes of the show had been thought to survive, efforts to locate missing episodes have been fruitful, with seven episodes being accounted for by 2013. On 23 October 2014, two episodes were recovered by the British Film Institute from the David Frost collection, and a further two episodes were recovered the following year, making the number of complete episodes eleven out of thirteen.

Frost approached Cleese, Chapman and Brooke-Taylor to star in a sketch series. They suggested Marty Feldman, until then a comedy writer. The series bridged the radio series I'm Sorry, I'll Read That Again and television's Monty Python's Flying Circus and The Goodies. It also led to Feldman's television series Marty (which also featured Tim Brooke-Taylor). The convention of comedy scenes interspersed by songs was abandoned. It still used punchlines, which would often be dispensed with in Monty Python's Flying Circus.

Several sketches came from the 1963 Cambridge Footlights Revue entitled Cambridge Circus (the revue was previously entitled A Clump of Plinths), including Graham Chapman's solo routine "One-Man Wrestling". Certain sketches from the show would later be reused in the one-off John Cleese special How to Irritate People ("Freedom of Speech"), as well as the second episode of Monty Python's Fliegender Zirkus ("One-Man Wrestling" again – now with play-by-play commentary added by Cleese – and "Hearing Aid Shop"). Further sketches were reprised in the Python stage shows, including the "Four Yorkshiremen" sketch (as featured on Live at Drury Lane, Live at City Center, Monty Python Live at the Hollywood Bowl, and Monty Python Live (Mostly)), "One-Man Wrestling" once again (Drury Lane, City Center, and Hollywood Bowl), "Secret Service" (Drury Lane only), and a few that have never received official release: "Beekeeper," the aforementioned "Hearing Aid Shop," and "Minister Falling to Pieces". The "Beekeeper" sketch was also performed in the Secret Policeman's Ball stage shows, as were "Top of the Form" and "Take Your Clothes Off!". Another, the "Bookshop" sketch, was recorded in modified form for Monty Python's Contractual Obligation Album. New versions of "Door to Door Undertaker" and "Memory Training Course" were also recorded during that album's sessions, but not included on the final version (they would, however, end up appearing on the widely bootlegged Hastily Cobbled Together for a Fast Buck album). "Psychiatrist", "Tea Boy on a Mission", and "Grublian Holidays" were also performed again by The Two Ronnies.

Monty Python's catchphrase, "And now for something completely different," parodying a phrase often used on Blue Peter, originated in At Last the 1948 Show, and was originally spoken by Aimi MacDonald, who played a dumb blonde.

The shows had no relationship to the year 1948; according to Cleese, the title referred to television executives' tendency to dither extensively over commissioning decisions. Feldman claimed in eyE Marty, his posthumously published autobiography, that he came up with the title, which "meant nothing". The series was video-taped at Rediffusion's Wembley Studios.

A total of thirteen 25-minute episodes were made within a year, six in the first series and seven in the second.