Melchior Vulpius (ca. 1570, Wasungen – 7 August 1615) was a German singer and composer of church music.
Vulpius came from a poor craftsman's family. He studied at the local school in Wasungen (in Thuringia) with Johannes Steuerlein. From 1588, he attended the school in Speyer. After marrying in 1589, he obtained a position at the Gymnasium in Schleusingen. In 1596, he was named cantor in Weimar.
He wrote and published church music, the best known being the setting of the hymn Ach, bleib mit deiner Gnade on a text by Josua Stegmann. This setting was often performed in Protestant churches on New Year's Day and at the end of the service. Important compilations were Cantiones sacrae (1602, 1604), Kirchengesänge und geistliche Lieder Dr. Luthers (1604), Canticum beatissimae (1605) and Ein schön geistlich Gesangbuch (1609). The Cantional (a collection of songs) was published posthumously in 1646 in Gotha.