Simon Greblo (also Šimun Greblo, Simon Greblić) (ca. 1472 - after 1539), was a Croatian priest, intellectual, Glagolitic writer and scribe. He was one of the most noted connoisseurs of the Glagolitic alphabet at the end of the 15th century. Greblo is generally considered the brightest Croatian copyist of his day. His calligraphy has been especially praised. While not an original author, his knowledge of cultural and literary interests of the day, taste and acumen in making literary choices have been noted.