Johan August Bång was a Swedish mill owner, shipyard owner, businessman and artist.

Johan August Bång was the son of Lars Augustin Bång and Elisabeth Wedin.

He wanted to become an artist, but at the age of 22, after the death of his father in 1853, he took over the Bång shipyard in Gävle. This burned down in the town fire in Gävle in 1869. In 1873, together with Olof August Brodin and the traffic manager at the Gefle-Dala railway Carl Hyckert, he founded the short-lived Brynäsvarvet (Gefle Varv).

Johan August Bång moved to Stockholm, where he became a real estate developer and built the Bångska palace at Stureplan. He had set up a studio for himself in the Bång House and studied painting under Anders Kallenberg and Per Daniel Holm. He painted landscapes, especially from the Halland coast, and exhibited at the Paris Salon on several occasions, as well as at the Royal Academy of Fine Arts exhibition in 1877 and the Nordic Art Exhibition in Gothenburg in 1881.

He built his own stately country house Frivy with a park for himself at Fredriksskans in Gävle. Bång is represented at Gävle Museum.

He was married to Ulrika Lovisa Luth from 1856 until his death. They are buried at Norra begravningsplatsen outside Stockholm.