Bob Mullan Motors Limavady won Independent Garage of the Year and David Prentice, of BMW Portadown, won Franchised Dealer Garage of the Year.
The winners have recently made investment in their businesses, with Bob Mullan Motors opening a new purpose-built showroom, boasting a coffee bar, children's entertainment, accessory shop and a wide selection of cars. David Prentice BMW completed a £2 million refurbishment programme, including a new workshop.
Both were recognised for their high customer service levels and range of services and facilities.
Noel Smyth, RMIF Northern Ireland regional manager, said: “Businesses who belong to the RMIF strive for excellence, and it is wonderful news when this excellence is justly rewarded.
“The Federation takes its commitment to quality customer care extremely seriously - these awards are evidence of that.”