Chock-A-Block is a BBC children's television programme, created by Michael Cole and Nick Wilson.

There were two presenters, Fred Harris ("Chock-A-Bloke") and Carol Leader ("Chock-A-Girl"), but only one appeared in each episode.

At the start of the show, the presenter would drive around the studio towards the machine in a small yellow electric car, the chock a truck, before saying the catchphrase "Chock-A-Bloke (or Girl), checking in!").

A typical show would include dialogue from the presenter, a brief clip played on Chock-a-Block's video screen, and the presenter recording a song on Chock-a-Block's audio recorder (which resembled the reel-to-reel tape drives used on actual mainframes, but with a design below to cause the reels to resemble the eyes of a smiling face).

In most episodes, Chock-a-Block would malfunction at least once by failing to respond to commands (a "Chock-a-Blockage") which had the presenter frantically pressing its buttons until it stopped.