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The Shuttlerworth and Wallace model (SW) was evaluated to estimate latent heat flux (LE) and actual evapotranspiration (ETa) above a drip-irrigated olive orchard, located in the Pencahue Valley, Maule region, Chile (35 22' LS; 71 47' LW; 150m above the sea level). For this purpose, measurements of climatic variables (air temperature, canopy temperature, wind speed and solar radiation), energy balance components (latent heat, net radiation, and soil heat fluxes), and stomatal resistance were collected during November-December 2009. The performance of the WS model (LEws) was evaluated using the eddy-covariance method (LEed) on a 30 minute time interval. Results indicate that the standard error of estimate (SEE) was 32 W m-2 and the mean absolute error (MAE) was 22 W m-2. On a daily basis, the SW model was able to simulate ETa with SEE and MAE values of 0.55 mm d-1 and 0.46 mm d-1, respectively.