The aim of the paper was to determine the links between SMP prices in Poland and SMP prices in selected countries. The article uses secondary data for the monthly price of butter at a level of countries collected by the Milk Market Observatory and the Italian Dairy Economic Consulting portal for 2000-2016. The analyzed period was divided into two periods: 2000-2004 and 2005-2016. The article uses Johansen cointegration tests, and Granger’s causality analysis. The analyzes in the first stage concerned the links between SMP prices in Poland and SMP prices in Western Europe, the USA and Oceania. In the second stage, the links between SMP prices in Poland and selected EU countries were identified. The results of the study confirmed a stronger link between SMP prices in Poland and SMP prices in Western Europe and Oceania. It is worth noting that these links mainly occurred in the period following Poland’s accession to the EU. Within EU countries, SMP prices in Belgium, the Czech Republic, Germany, Ireland and the Netherlands were related to prices in Poland.