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A method based on ultra-high performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry (UHPLC-MS/MS) for the simultaneous determination of benzimidazole residues in bovine milk has been optimized and validated. Rapid chromatographic separation of 13 analytes in 8 min was obtained by means of UHPLC. The samples were subject to Oasis MCX solid-phase extraction cartridges for extraction and clean-up. Matrix-matched calibration curves were performed to compensate for the matrix effect and loss in sample preparation. Mean recoveries ranged from 80% to 101% and inter-day precision was lower than 14%. Limit of detection and limit of quantification of the method ranged from 0.01 to 0.5 mu g L-1 and from 0.1 to 10 mu g L-1, respectively. (C) 2010 Elsevier B.V. All rights reserved.