Missal of duke Novak (Croatian: Misal kneza Novaka) was a 14th-century Glagolithic missal. The letters of the missal were later used for the first Croatian printed book Missale Romanum Glagolitice.
The missal itself was written in Croatian recension of the Church Slavonic language, in the Croatian angular Glagolithic script and quite possibly illuminated, by the royal knight Novak Disislavić on his estates in Krbava in 1368. The author's family descended from the Mogorović gentis, which at that time belonged to the medieval institution Nobiles duodecim generationum regni Croatiae. He was also named the duke of Šolgov in Hungary and duke of Nin in Dalmatia.
The missal was written as a pledged gift to a church, where he was to be buried after death.
The last page (colophon) also contains written down verses in Chakavian by the author, a sequence of Christian mortality:
I pomisli vsaki h(rst)janin
da se svyt ništare ni,
jere gdo ga veće ljubi,
ta ga brže zgubi.
Nu jošće pomisli vsaki sada:
ča se najde ot nas tada,
gda se d(u)ša strahom smete,
a dila n(a)m skriti nete...