PSID or Psid may refer to:
Science and technology
- Pounds per square inch differential, a unit of measurement
- PSID, a standard for MOS Technology SID music files
- Provider Service Identifier, in the family of Wireless Access in Vehicular Environments standards
- Physical Security ID, an ID present on all Self-encrypting drives
Other uses
- Panel Study of Income Dynamics, a long term survey of a set of households in the US
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