The Mercedes-Benz O 405 was a highly successful single-decker bus

Single-decker bus

A single-decker bus or single-decker is a bus that has a single deck for passengers. Normally the use of the term single-decker refers to a standard two-axled rigid bus, in direct contrast to the use of the term double-decker bus, which is essentially a single decked bus with an extra deck and...

 chassis built by Mercedes-Benz

Mercedes-Benz buses

Mercedes-Benz has been making buses since 1895 in Mannheim in Germany. Since 1995, the brand of Mercedes-Benz buses and coaches is under the umbrella of EvoBus GmbH, belonging 100 % to the Daimler AG.-Heritage:...

 from the mid-1980s to the early 2000s. It was the replacement for the Mercedes-Benz O305

Mercedes-Benz O305

Mercedes-Benz O305 is a rear-engined bus model built in West Germany between 1967 and 1987. The O305 was built as a successor of the O317 and was the Mercedes-Benz adaptation of the first so called "Standard-Linienbus" design, that was produced by many different German bus manufacturers. The...

 chassis and was widely used in Europe

Europe

Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 and Singapore

Singapore

Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...

.
The step-entrance version was known as the O 405. An articulated version of O 405 was also built, which was known as O 405 G.

There were two generations of O405 chassis, designated O405 MkI and O405 MkII.
The O 405 MkI was marketed between mid-1980s and early 1990s.