The purpose of this paper is to describe and analyse the seasonal concentration in Montenegrin tourism by means of the Gini coefficient. This method is applied to two monthly time series – tourist arrivals and tourist overnight stays, covering the period 2001 2011. Regarding the strength and dynamics of the seasonal concentration, the results of the study revealed the existence of strong as well as constant seasonality in Montenegrin tourism. Namely, the Gini coefficient for tourist arrivals ranges from 0.54 to 0.61, while for tourist overnight stays it goes from 0.61 to 0.67. In such unfavourable circumstances, Montenegro as a tourist destination should strongly focus on reducing strong and constant seasonality