SRD may refer to:

• Sardinian language's ISO 639 code
• Serenissimus Rudolfus Dux, a title of Archduke Rudolf of Austria
• Services Reconnaissance Department, an Australian WWII agency
• Short-range device for radio communication
• Sports Radio Detroit
• SR-D, a Dolby technology
• Stapleton Road railway station's station code
• Step recovery diode
• Surinamese dollar by ISO 4217 currency code
• System Reference Document in role-playing games
• Systems Research & Development, a Nintendo subsidiary
• Srđ, a mountain in Dalmatia, Croatia
• SRD: Super Real Darwin, 1987 video game