Prince Maciej Radziwià Âà  (; 10 November 1749 â 2 September 1800) was a PolishâÂÂLithuanian noble (szlachcic), composer and librettist.
Around 1780, Maciej (Matthias) lived at Nieà Âwieà ¼, the house of Karol Radziwià Âà Â, voivode of Vilnius, who maintained a company of actors, musicians and dancers there and at his estates in Alba (near Nieà Âwieà ¼), Oà Âyka, Sà Âuck, Biaà Âa Podlaska and elsewhere. While at Nieà Âwieà ¼, Radziwià Âà  wrote the libretto for Jan Dawid Holland's opera Agatka, czyli Przyjazd pana (âÂÂAgatha, or The Master's ArrivalâÂÂ) which was performed on 17 September 1784 during King Stanisà Âaw August's visit to Nieà Âwieà ¼. He also wrote the libretto and composed the music for the three-act opera Wójt osady albiaà Âskiej (âÂÂThe Headman of the Settlers at AlbaâÂÂ) which premiered in Alba on 4 November 1786.
Radziwià Âà  was owner of Szydà Âowiec, Grand Podkomorzy of Lithuania since 1786, and castellan of Vilnius since 1788. He moved to Vilnius where he composed some instrumental and orchestral music and was awarded with the Order of the White Eagle on February 18, 1788.