Russian Bank, Crapette or Tunj, historically also called Wrangle, is a card game for two players from the patience family. It is played with two decks of 52 standard playing cards. The U.S. Playing Card Company, who first published its rules, called it "probably the best game for two players ever invented".

The goal of Russian Bank, like many card games, is for the player to get rid of forty-eight cards before their opponent can rid themselves of theirs. At the same time, it is required to build "piles" of suits, Ace through King, in the center of the board. If a rule regarding the placement of piles is broken, the opponent may call "Stop!" (or "Tunj!") to end one's turn.

Commercially produced versions of Russian Bank include Skip-Bo and Spite and Malice.