Johan Voltmar (c. 1685 – ?) was a German musician and composer, who lived in Copenhagen, Denmark from c. 1711, together with his family. Voltmar was married to Anne Margretlie Elisabeth Voltmar, who also possessed artistic talent. Together, they had at least 3 daughters and 4 sons, who also were accomplished artists. Johan Voltmar's compositions include a flute sonata and a concert for four flutes, 2 violins and double bass.