This article deals with variations on game rules and game terminology. For variations on game playing, see Euchre game variations.

Euchre ( /ˈjuːkər/) is a 19th century trick-taking card game with many popular variations on how to play the game and changes in the rules. Some of these variations are listed below.

The addition of extra cards like 8 and 7, can usually add more uncertainty as for which trump cards are still in the opponent's hands during the course of the game. This uncertainty may be increased with the addition of the 2s.

In some Euchre circles it is considered acceptable to "steal the deal" from the other team if they are not paying attention when it is their turn to deal.

If a player is dealt a hand consisting entirely of 9's and 10's, they may declare a 'McEvoy', resulting in a re-deal by the same dealer. The McEvoy must be declared, and the cards must be displayed immediately after the deal, before any player calls trump or passes. All players' cards are returned and re-dealt. Only one McEvoy is allowed per player per match.