| SPA | Simple Power Analysis | In English | → Hardware |
| SPA | Sociedade Portuguesa de Andrologia | In Portuguese | → Organizations and associations → Sexual problems → Urology |
| SPA | Social Policy Analysis | In English | → Politics → Public administration, government |
| SPA | Socialistische Partij Anders | In Dutch | → Political parties and movements |
| SPA | Société Protectrice des Animaux | In French | → Organizations and associations → Nature and society |
| SPA | SBand Power Amplifier | In English | → Telecommunications |
| SPA | Servopower Amplifier | In English | → Mechanical engineering |
| SPA | Servopower Assembly | In English | → Mechanical engineering |
| SPA | Shared Peripheral Area | In English | |
| SPA | Signal Processor Assembly | In English | → Hardware → Electronics → Telecommunications |
| SPA | Small-Payload Accommodations | In English | |
| SPA | Software Product Assurance | In English | → Software |
| SPA | Space Processing Application | In English | → Spaceflight engineering, astronautics |
| SPA | Steering Position Amplifier | In English | → Vehicle engineering |
| SpA | Società per Azioni = AB | Akcinė bendrovė | In Lithuanian = AK | Akcia Kompanio | In Esperanto = AT | Акцыянэрнае таварыства | In Bulgarian = AS | Aktsiaselts | In Estonian = AG | Aktiengesellschaft | In German = DD | Dioničko Društvo | In Croatian = AS | Aksjeselskap | In Norwegian = AS | Aktieselskab | In Danish = SA | Spółka Akcyjna | In Polish = SA | Societăţi pe Acţiuni | In Romanian = AB | Aktiebolag | In Swedish = AD | Akcionarsko Društvo | In Serbian = DD | Delniška Družba | In Slovenian = AS | Akciová Spoločnosť | In Slovak = AS | Akciová Společnost | In Czech = AT | Акціонерне товариство | In Ukrainian |
In Italian | → Economics |
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