The brand has backed the capital club since 2013.
The partnership includes the club receiving five Mitsubishi vehicles and support from their local dealer, Belmont Mitsubishi, in Sighthill. In return the Mitsubishi logo will appear on the club’s shirts and there will be significant branding around the stadium.
Managing director of Edinburgh Rugby, Jonny Petrie, said: “We’re delighted to continue the partnership with Mitsubishi and Belmont. Being able to work with a good local dealer and strong brand like Mitsubishi is great for us.”’