CDK is a library written in C that provides a collection of widgets for text user interfaces (TUI) development. The widgets wrap ncurses functionality to make writing full screen curses programs faster. Perl and Python bindings are also available.

There are two versions of the library. It was originally written by Mike Glover, introduced as version 4.6 in comp.sources.unix. The other version was extended beginning in May 1999 by Thomas Dickey.