Prince Maciej Radziwiłł (Lithuanian: Motiejus Radvila) (10 November 1749 – 2 September 1800) was a Polish-Lithuanian noble (szlachcic), composer and librettist.

Around 1780, Maciej (Matthias) lived at Nieśwież, the house of Karol Radziwiłł, governor of Vilnius Province, who maintained a company of actors, musicians and dancers there and at his estates in Alba (near Nieśwież), Ołyka, Słuck, Biała Podlaska and elsewhere.

While at Nieśwież, Radziwiłł wrote the libretto for Jan Dawid Holland's opera Agatka, czyli Przyjazd pana (‘Agatha, or The Master's Arrival’) which was performed on 17 September 1784 during King Stanisław August's visit to Nieśwież.

He moved to the town of Vilnius where he composed some instrumental and orchestral music and was awarded with the Order of the White Eagle on February 18, 1788.

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