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A patch can refer to:

• an embroidered patch applied to clothing by organizations or individuals
• a piece of textile or fabric used to repair a hole in a larger piece
• an eyepatch, used in the treatment of eye disorders such as amblyopia or strabismus (referred to as patching), or for aesthetic purposes in covering an injured or missing eye

• a piece of material, such as an adhesive plaster, used medically usually to cover a wound
• a transdermal patch (such as a nicotine patch used to quit smoking, or a contraceptive patch used to prevent pregnancy)

• a patch (synthesizer) is a sound setting for musical synthesizers
• a patch cable, an electrical cable which can be used to alter the functionality of a piece of electrical equipment, such as a musical modular synthesizers.
• a telephone patch is any connection between a phone line and another communications device, whether it be a radio, a tape recorder, a data device (such as a modem), or even another phone line. Sometimes called an autopatch especially when used in amateur radio

• a group of company houses
• a habitat patch; see landscape ecology#Patch and mosaic
• a small garden, or a place where specific fruits or vegetables are grown (e.g. pumpkin patch)

• Patches (Dickey Lee song), a tragic 1962 ballad
• "Patches", a hit record for Chairmen of the Board, later covered by Clarence Carter

• Alexander Patch, general of US Army in World War II
• Hunter "Patch" Adams, founder of the Gesundheit! Institute
• Steve "Patch" Johnson, a ficitional character on Days of Our Lives
• Patch, a fictional character from The Tribe. He was played by Morgan Palmer-Hubbard.

• Patch (computing), a fix for a software program where the actual binary executable and related files are modified. Often this is used to repair a software bug or a security vulnerability.
• patch (Unix), a UNIX utility that applies a script generated by the diff program to a set of files, allowing changes from one file to be automatically applied to another file.
• A 3-D Bézier curve used in computer graphics, or a primitive in some 3-D software packages
• The name of an IBM utility to edit binary files (typically on mainframe installations, eg. MVS)

• an American Kennel Club registered name as well as a popular name to call a pet dog
• the practice of compulsory figures in figure skating
• an insignia used as an identification mark by members of a group, such as shoulder patch
• a locomotive or freight car that has been renumbered without a full repaint in railfan terminology

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