The term blade may refer to the following:
- the sharp cutting part of a tool or weapon
- a type of stone tool in archeology, created by striking a long narrow flake from a stone core
- a heavy, usually curved metal plate installed on the front of a bulldozer
- leaf blade (or lamina), the flat part of a leaf
- tongue blade, the portion just behind the tip of the tongue
- a generalization of vectors in higher-dimensional vector spaces in geometric algebra
- Blade server, a type of computer server designed to be modular and use minimal physical space and energy
- Blade PC, a type of client PC also designed to be modular and use minimal physical space and energy