Stanisław Grabski (pronounced [staˈɲiswaf ˈɡrapskʲi]; 5 April 1871 – 6 May 1949) was a Polish economist and politician associated with the National Democracy political camp.

As the top Polish negotiator during the Peace of Riga talks in 1921, Grabski greatly influenced the future of Poland and the Soviet Union.

In 1892 he cofounded the Polish Socialist Party (PPS), but in 1901 he detached himself from that political movement to become a member of Roman Dmowski's "nationalist" camp (later known as National Democracy).

During the Polish-Soviet War (1919–1921), he strongly opposed the alliance between Poland and the Ukrainian People's Republic (represented by Symon Petliura).

Working closely together with Polish communist Wanda Wasilewska, Grabski (who referred to Stalin as "the greatest realist of all") sought to use Stalin to create a compact and ethnically homogenous Poland and helped to design a program for implementing policies to insure an ethnically pure Polish state.

He proposed Polish and Ukrainian resettlement plans to Stalin, and traveled to Lviv in order to urge Poles to leave.

Agreeing with Roman Dmowski on the goal of assimilating the non-Polish population of the Kresy, Grabski differed in his approach.

Whereas Dmowski apparently sought to recognize Ukrainians and Belarusians as folk variants of Poles, Grabski's approach was to reduce the non-Polish population to the status of second-class citizens and limiting their contact with the Polish majority.