Abagar ("Абагар") is a breviary by the Bulgarian Roman Catholic Bishop of Nikopol Filip Stanislavov printed in Rome in 1651.
The language of the breviary is a specific blend of modern Bulgarian and Church Slavonic with Serbo-Croatian influences, that was used in writing by the Catholics from Chiprovtsi, Bulgaria, in the period.
Unlike many other works of the Bulgarian Roman Catholics, it was printed in Cyrillic and not Latin.
The book is named after the apocryphal message of King Abgar to Jesus that was included.
It was not until 2001 that an edition translated to standard modern Bulgarian (by Kiril Kabakchiev) was published.