The 1977 World Snooker Championship is a professional snooker tournament that took place from 18 to 30 April 1977 at the Crucible Theatre in Sheffield. John Spencer won his third World Snooker Championship title by defeating Cliff Thorburn by 25 frames to 21 in the final. It was the first time the championship was held at the Crucible, which has remained as the venue for the Championship. The tournament was sponsored by cigarette manufacturer Embassy.

Snooker is a cue sport played on a rectangular billiards table covered with a green cloth called baize, with six pockets, one at each corner and one in the middle of each long side. First played by British Army officers stationed in India in the second half of the 19th century, the game is played with twenty-two balls, comprising a white cue ball, fifteen red balls, and six other balls—a yellow, green, brown, blue, pink, and black—collectively called the colours. Using a cue stick, the individual players or teams take turns to strike the cue ball to pot other balls in a predefined sequence, accumulating points for each successful pot and for each time the opposing player or team commits a foul. An individual frame of snooker is won by the player who has scored the most points. A snooker match ends when a player reaches a predetermined number of frames.