This document describes the calibration and validation of the AquaCrop model for irrigated peanut production in lowland rice systems in southern Laos. The model was able to satisfactorily simulate canopy cover, biomass, and yield under well-watered conditions but performed poorly under water-stressed conditions. Soil water simulations were also very poor. Further experimentation is needed to improve the model's ability to simulate water movement and stress conditions to provide more reliable recommendations for farmers.