An eight-ender is a perfect score within a single end of curling, with one team scoring the maximum possible value of eight points—one for each rock the team put in play during the end.

An eight-ender is analogous to a perfect game in baseball, a perfect game in bowling (300) or a nine-dart finish in darts. Such a feat is extremely unusual at any level. To score an eight-ender almost always requires employment of an unusually aggressive strategy (in particular, eschewing the placement of guards, which usually do not score, especially with the early stones of an end) in addition to some combination of mistake-free play, poor play from the opposing team and good luck.

Eight-enders are even more rare in competitive curling. They are so uncommon that the Canadian Curling Association has an award to recognize any eight-ender scored in Canada. The eight-ender in team curling is analogous to the six-ender in mixed doubles curling, as there is a total of six rocks in play per team instead of eight.

There has never been an eight-ender in Olympic competition, the closest being a 'seven-ender' scored by Great Britain's Eve Muirhead at the 2014 Winter Olympics, in a 12–3 round-robin stage victory over the United States. In mixed doubles curling, the maximum score of six has been achieved at the Olympics, with Switzerland's Jenny Perret and Martin Rios doing so against the United States in the last end of their 9–4 round-robin win at the 2018 Winter Olympics. Eight-enders have never been scored at the Brier or Tournament of Hearts. The only eight-ender during the World Curling Championships was accomplished by Switzerland during the 2021 World Women's Curling Championship.

At the 1952 Canadian Schoolboys Championship (now called the Canadian Junior Curling Championships), Saskatchewan's Gary Thode rink scored an eight-ender in the fifth end against Quebec (skipped by Gilles St. Hilaire) to take a 14–2 lead. To score eight, a nervous Thode had to hit and stick a Quebec stone in the back 12. In those days, it was not the custom for teams to concede early (even after the winner was conclusively determined) so they continued to play all 10 ends with Saskatchewan going on to win the match 17–5. To date, it has been the only eight-ender in Canadian juniors history. Saskatchewan went on to win the tournament.

At the 1958 New Brunswick Ladies Curling Championship, Margaret Williamson's rink (skipped by third-thrower Mary McMurray) from Bathurst, New Brunswick, scored an eight-ender in the tenth and final end in their final match of the tournament against Karen Jorgenson's team from Dalhousie. The Bathurst rink, which had been trailing 10–7 heading into the final frame, won the game 15–10, and the provincial championship.

At the 1973 United States Women's Curling Association bonspiel (a forerunner to the United States Women's Curling Championship) in Appleton, Wisconsin, the Wilmette, Illinois, rink skipped by defending champion and former Canadian champion Betty Duguid scored an eight-ender in their game against a rink from Virginia, Minnesota. The Wilmette team won the game 12–6. It was the first time an eight-ender had been recorded at the event.

In 1993, the team of Kim Gellard, Corie Beveridge, Lisa Savage, and Sandy Graham recorded two consecutive eight-enders.