The two-year partnership will see Europcar provide fleet support to Triathlon Ireland and the creation of a Europcar Series of Triathlon events.
The deal provides two Skoda Yetis for Triathlon Ireland staff to use at triathlon events around the country and transport support for athletes in Triathlon Ireland's elite programme.
The Europcar Mini Series will include the following events: Carrick-on-Suir Triathlon, Co Tipperary; Brian Boru Triathlon; Killaloe, Co Clare; and Fingal Triathlon, Blanchardstown.
Europcar will also be present at many other triathlons over the course of the season.
Chris Kitchen, CEO of Triathlon Ireland, said: "The Europcar sponsorship deal is fantastic for Triathlon Ireland.
"We want to offer a service that is second to none to our TI Members, Clubs, Elite Athletes, Coaches, Officials, Event Organisers and Sponsors and this involves a huge amount of travel and logistics.
"The Europcar Partnership will provide our key staff and Elite Athletes with an efficient and effective way to manage our vehicle requirements."