Gustav Macoun, baptised Augustin Alois was a Czech landscape painter and footballer before World War I.

He was born in Prague into the poor family of the shoemaker Augustin Macoun. From childhood, he showed a talent for painting, and after completing his basic education, he trained briefly with the painter Václav Jansa . On his recommendation, he attended a painting course with Alois Kalvoda in 1907 and Antonín Slavíček 's studio in 1908–1909. There he decided to be a painter and in 1909–1913 he completed his full-time studies at the Prague Academy of Painting with prof. Vlaha Bukovac.

He lived most of his life in Prague in Vinohrady , he was married to his wife Jiřina (ballet artist). He probably painted for the first time in Kameničky in the period 1914–1915. In the years 1925–1932 he regularly stayed in the old Lopun mill in the Vysočina region. At the end of his life, he spent two years in Svobodné Hamry, where he owned a timbered cottage in 1932–1934. There is now a monument with a memorial plaque commemorating his stay and work.

The painter died in 1934 at the General Hospital in Prague of pneumonia.