The Coin Collection of the Bilecik Museum contains 742 ancient and Islamic coins. The subject of this article is 147 Byzantine coins which were recorded through a study carried out in the Bilecik Museum in 2013. Of these 147 coins, 81 coins are gold (a hoard), 65 coins are bronze and 1 coin is billion. Byzantine gold coins in the museum are from the reign of Justinian I (527-65), Justin II (565-78), Maurice (582-602) and Phocas (602-10). Bronze coins are dated to Anastasius I (491-518) and Manuel I Komnenos (1143-1180) periods. Although the number of Byzantine coins in the museum is less than sufficient for a general assessment, the data provided by this collection is important for scholars to understand the circulation of Byzantine coins in Anatolia.