Drought stress is the main constraint to groundnut production but encouraging results are flowing from drought phenotyping using a lysimetric system in Niger. The study assessed 60 groundnut genotypes under intermittent drought stress and well-watered conditions in lysimeters, identifying several genotypes with high yield under both conditions, including ICG 3312 and ICG 81, which were also short in duration and drought tolerant. Traits like grain weight and harvest index were associated with drought tolerance, while water requirement and use may determine tolerance.