Martin of Opava, O.P., (died 1278) also known as Martin of Poland, was a 13th-century Dominican friar, bishop and chronicler.
Known in Latin as Frater Martinus Ordinis Praedicatorum (Brother Martin of the Order of Preachers), he is believed to have been born, at an unknown date, in the Silesian town of Opava (German: Troppau), at that time part of the Margraviate of Moravia. Thus in German he appears as Martin von Troppau and in Czech as Martin z Opavy.
From the middle of the 13th century, Martin was active in Rome as confessor and chaplain for Pope Alexander IV and his successors, Pope Urban IV, Pope Clement IV, Pope Gregory, Pope Innocent V, Pope Adrian V and Pope John XXI (d. 1277), the last pope to appear in his chronicles. On 22 June 1278, Pope Nicholas III, while in Viterbo, appointed him Archbishop of Gniezno.
While en route to his new episcopal see, Martin died in Bologna, where he was buried at the Basilica of St. Dominic, near the tomb of the founder of his Order.