HCD or hcd may refer to:
Science and technology
- Hectocandela (hcd), a unit of luminous intensity
- Higher-energy collisional dissociation, a mass spectrometry technique
- Highest common divisor
- Host controller driver, for a Host controller interface (USB, Firewire)
- Human-centered design
Other uses
- HC Davos, a Swiss ice hockey club
- California Department of Housing and Community Development, US
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