Sikorski, who headed the London-based Polish government-in-exile during World War II, died in an air crash near Gibraltar on July 4, 1943.
He was flying back to England after visiting Gibraltar when his Liberator plane plunged into the sea shortly after take-off, according to historians.
Officials and veterans were on Tuesday expected to honour Sikorski during ceremonies in Gibraltar.
Jan Józef Kasprzyk, head of Poland's Office for War Veterans and Victims of Oppression, has said that Sikorski was "a symbol of hope" for his compatriots when he became prime minister and commander-in-chief of the Polish armed forces during World War II.
Sikorski led a London-based government-in-exile set up after the German and Soviet invasion of Poland in September 1939.
After the Germans invaded the Soviet Union in 1941, Sikorski signed a treaty with Moscow, his erstwhile foe, to free hundreds of thousands of Polish POWs into an exile army.
"He embodied what is most beautiful in our Polish tradition: a love of freedom and a love of independence," Kasprzyk said of Sikorski.
In an early tribute, flowers were placed at the tomb where Sikorski is laid to rest among monarchs and national luminaries at Wawel Cathedral in the southern Polish city of Kraków.
Gen. Władysław Sikorski's final resting place is among monarchs and national luminaries at Wawel Cathedral in the southern Polish city of Kraków. Photo: Institute of National Remembrance/krakow.ipn.gov.pl
Sikorski was originally buried at a Polish military cemetery in Newark in central England. His remains were brought to Poland in 1993.
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Source: IAR, polskieradio.pl, ipn.gov.pl