Four engines are currently dealing with the fire in Daffil Grove, Churwell.
West Yorkshire Fire Service said the smoke can been from the M621 motorway.
A spokesman said an area of grass measuring approximately 100m x 200m was alight.
Crews from Morley, Hunslet and Leeds were dispatched shortly before 4pm when the fire was first reported.
Firefighters are using a large jet and beaters to put out the fire.