Gustave Eugène Castan (1823, Geneva – 1892, Crozant) was a Swiss landscape painter of the Romantic period. In 1843, he began his training as an artist in Alexandre Calame’s studio, traveling with him to Italy and the Bernese Oberland. In 1849, he met the French painter Eugène Castelnau and went with him to Paris. Three years later, he met Jean-Baptiste Camille Corot, who strongly influenced his artistic work. The moody, mystical atmosphere in his landscapes can most likely be traced back to him. Between 1855 and 1882, Castan exhibited his landscape paintings 23 times in Paris salons. He was a founding member of the Society of Swiss Painters, Sculptors and Architects (GSMBA) and deputy curator at the Historical Museum, Geneva.