High definition or HD may refer to:
Visual technologies
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Blu-ray Disc, the universal optical High Definition disc format
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HD Photo, former name for the JPEG XR image file format
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HDV, format for recording high-definition video onto magnetic tape
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HiDef, 24 frames-per-second digital video format
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High-Definition Multimedia Interface (HDMI), all-digital audio/video interface capable of transmitting uncompressed streams
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High-definition television (HDTV), television signals and apparatus with higher resolution than their contemporary counterparts
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Ultra-high-definition television, a further step in television resolution, but not a successor.
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High-definition video, used in HD broadcasting, digital film, computer HD video file formats, and video games
Audio technologies
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Dolby TrueHD, lossless audio compression codec
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DTS-HD Master Audio, lossless audio compression codec
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High Definition Compatible Digital, discontinued digital audio optical disc format
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High-definition audio, general marketing term for high fidelity audio products and services
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Intel High Definition Audio, 2004 Intel specification for hardware and associated drivers for Personal computer audio
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Wideband audio, also known as HD voice, is high definition voice quality for telephony audio
Music
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"Hi-Definition", 2008 single from Lupe Fiasco's The Cool
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High Definition (Joe Morris album), 2008
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High Definition (Shootyz Groove album), 1999
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"High Definition", a single from Waterparks' 2019 album, Fandom
Other
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High Definition (radio program), 2006 Canadian radio program
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High-definition map, used in autonomous driving
