Bleeding usually means the leakage or loss of blood from the body.

Bleeding, bleed, or bleeder may also refer to:

• Bleed (printing), intentionally printing across the expected trim line or edge of the sheet
• Bleed, or spill (audio), when audio from one source is picked up by a microphone intended for a different source
• Bleed, the presence of surface water on concrete
• Bleed air, compressed air taken from gas turbine compressor stages
• Bleeder, baseball term for a weakly hit ground ball that goes for a base hit
• Bleeder resistor, which passively discharges a capacitor when it is disconnected or equipment is powered off
• Bleeding (computer graphics), a computer graphics term for when a graphic object passes through another in an unwanted manner
• Bleeding (roads), a type of pavement distress common in asphalt roads
• Bleeding, or capillary action, the ability of a substance (such as blood, ink, or water) to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity
• Bleeding, purging air from a radiator, brake line, fuel line, etc.
• Bleeding, the migration by dissolution of a component of a composite, e.g., pigments bleed into some plasticizers
• Bleeding order, a relation between rules in linguistics
• Bloodletting, a practice once believed to cure diseases