The Swiss Transportation Safety Investigation Board (STSB, German: Schweizerische Sicherheitsuntersuchungsstelle; French: Service suisse d'enquête de securité; Italian: Servizio d'inchiesta svizzero sulla sicurezza) is a government agency of Switzerland.

It investigates civil aviation accidents and incidents and cableway, roadway, waterway, and railway accidents.

The aviation division is based at Payerne Airport in Payerne and the rail/navigation division is based in Bern.

[1] The Swiss Accident Investigation Board (German: Schweizerische Unfalluntersuchungsstelle; French: Service d'enquête suisse sur les accidents; Italian: Servizio d’inchiesta svizzero sugli infortuni) was established on 1 November 2011 when the Aircraft Accident Investigation Bureau and the Investigation Bureau for Railway, Funicular and Boat Accidents merged.

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