The Mercedes-Benz O305 is a single deck and articulated bus manufactured by Mercedes-Benz in Mannheim, West Germany from 1969 until 1988. It was built as either a complete bus or a bus chassis and was the Mercedes-Benz adaptation of the unified German VöV-Standard-Bus design, that was produced by some different bus manufacturers including Büssing, Magirus-Deutz, MAN, Ikarus, Gräf/Steyr, Heuliez, Renault, and Pegaso. The O305 was designed for use as a single-decker bus, however it was later redesigned to accommodate double-decker bodies.

Mercedes-Benz has been producing buses since 1895 in Mannheim in Germany. Since 1995 Mercedes-Benz buses and coaches is a brand of EvoBus GmbH, a wholly owned subsidiary of Daimler Truck.