A simplified alternative to the wet digestion sample preparation procedure for roasted ground and instant coffees has been developed and validated for the determination of different elements by inductively coupled plasma optical emission spectrometry (Al, Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr, Zn) and flame atomic absorption spectrometry (Ca, Fe, K, Mg, Na). The proposed procedure, i.e., the ultrasound-assisted solubilisation in aqua regia, is quite fast and simple, requires minimal use of reagents and demonstrated good analytical performance, i.e., accuracy from -4.7 to 1.9%, the precision within 0.5-8.6% and recovery in the range 93.5-103%. Detection limits of elements were from 0.086 ng mL(-1) (Sr) to 40 ng mL(-1) (Fe). A preliminary classification of 18 samples of ground and instant coffees has successfully been made based on concentrations of selected elements and using the principal component analysis and the hierarchic cluster analysis.