Zangeki no Reginleiv (斬撃のREGINLEIV, Zangeki no Reginleiv, lit. "The Slashing of Reginleiv"^?), originally titled Dynamic Slash, or Dynamic Zan, is an action game for the Wii developed by Japanese developer Sandlot and published by Nintendo. It was first revealed at Nintendo's conference on October 2, 2008. It was released on February 11, 2010 in Japan. No North American, European, or Australian release dates have been announced. With its black cover design, it is the third game to break the tradition of white keep cases for Wii video games; the first two were New Super Mario Bros. Wii and Metroid Prime Trilogy.

The story is an adaption of the Ragnarok story of Norse mythology. The player controls one of two angelic siblings, Frøy and Freia, who serve the Norse gods by battling the races of giant that have emerged, leading to the eventual re-birth of the world. While the game takes considerable artistic license with the source material, it does reflect events and characters from the original myth.