The Mercedes-Benz OC 500 LE is a modular, heavy-duty, twin-axle bus chassis produced by Mercedes-Benz/EvoBus Ibérica, Spain.

It was designed as a modular platform for low-entry city, suburban, and intercity buses with a maximum gross vehicle weight of 19.1 tonnes.

Large numbers of buses built on the OC 500 LE chassis can be found in Australia, where it was originally marketed as the O 500LE.

[6][7] There have been 15 OC 500 LE CNG fires in Perth, and in October 2013, the Public Transport Authority commenced legal action against Mercedes-Benz, Evobus and Volgren.

There are two gas tanks (indicated by two CNG stickers on number plate) located on top of the bus near the front.

Brisbane Transport withdrew its OC 500 LEs from the fleet for a short period because of a major unidentified fault which caused buses to suddenly accelerate without warning.

[16] In January 2009, Mercedes-Benz Australia issued a recall on 443 CNG-fuelled OC 500 LE units due to respecified welding specifications for the turbocharger oil supply pipe.

These buses feature bodywork built by Gemilang Coachworks of Malaysia and assembled by Thonburi Busbody Limited of Thailand,[18] with a CapaCity licensed front from Mercedes-Benz, engines that meet Euro V emission standards and are SMRT's first wheelchair accessible buses (WABs).

The first Mercedes-Benz OC500LE took part in the launch of SMRT's Go Green event on 30 April 2008, which is SMB1H and deployed passenger service debut on Bus 190.

Small numbers of OC 500 LEs bodied by MCV have entered service in the United Kingdom.

Ikarbus offers suburban version with softer anti-vandal seats and a place for hand luggage.