Stefania and Jan Buchala were posthumously declared as Righteous Among the Nations, an honour bestowed by Yad Vashem, Israel’s Holocaust memorial, in a ceremony attended by their grandson.
The 87-year-old Polanski, who now lives in France, travelled to Poland for the occasion.
Polanski recalled Stefania Buchala as an “extremely noble and religious person” who had the courage to risk not only her own life in sheltering him, but also the lives of her children.
The couple’s grandson, Stanislaw Buchala, received the distinction on behalf of his late grandparents from Israel’s deputy ambassador at a Jewish memorial centre in Gliwice, a southern Polish city.
City authorities also attended the ceremony.
Polanski was nine years old when his parents made him escape from the Krakow Ghetto during the German occupation of Poland during the Second World War.
Both of his parents were soon after deported to death camps.
He was given shelter by the Buchalas from 1943-45, in the small southern village of Wysoka.
They are among some 7,000 Poles now recognised by Yad Vashem for saving Jews from certain death at the hands of Nazi German forces.
More people from Poland have been recognised for such heroism than from any other country.
Polanski’s mother died in Auschwitz, but his father survived the Mauthausen camp and the two were reunited after the war.
Among Polanski’s award-winning projects is a story of Holocaust survival, the 2003 film the The Pianist.