Zwei (German: "two") may refer to:

• Zwei (band), a Japanese duo band
• ZWEI, a text editor
• Zwei!!, an action role-playing video game developed by the Nihon Falcom Corporation
• Zwei, a team in Infinite Ryvius anime series
• Zwei, a character in Phantom of Inferno anime series
• Zwei, a Pembroke Welsh Corgi in the anime series RWBY.
• Project Zwai, the codename for the upcoming video game The Evil Within

EINE and ZWEI were two Emacs-like text editors developed by Daniel Weinreb and Mike McMahon for Lisp machines in the 1970s and 80s.

is an action role-playing game developed by Nihon Falcom Corporation. It has been released on three platforms so far: Windows, PS2 and the PSP. The title itself is derived from the German word "zwei" meaning "two". An online version called Zwei!! Online, developed by Korean developer Neonsoft Corporation, was announced on August 2, 2007. A sequel Zwei II was released for Windows on September 25, 2008.

Die Zwei (2) ist die Natürliche Zahl zwischen Eins und Drei. Sie ist gerade und eine Primzahl.