Many engineering applications, such as wind energy distribution for optimum site selection for wind farms, pollutant dispersion, forest fire propagation and wind loads on structures in hilly terrains require a thorough understanding of the wind flow. The assessment of wind loads on buildings and structures located on exposed hill sites is a key application for understanding the effect of topography. This paper presents a wind tunnel investigation of along-wind aerodynamic forces on a rectangular plan building located near and on top of a gently sloped sinusoidal hill. The hill model has a slope equal to 15° and extends fully across the width of the wind tunnel in the direction perpendicular to the wind flow. A force measurement study is carried out on a rectangular plan rigid building model, which is placed near and on top of the hill at a total of 17 successive locations. Results measured include along-wind base shear forces and base moments. It is observed that the along-wind force gradually increases, as the building is moving closer towards the crest. The maximum along-wind base shear force for the building is reported just upstream of the crest. Increased along-wind base moment for the building up to a factor of 4.0 is observed at the crest. This paper is expected to be of great help to structural engineers for designing buildings in hilly terrains.