Otto Morach (2 August 1887, Hubersdorf - 25 December 1973, Zürich) was a Swiss painter and poster artist.
After completing his primary studies he began attending the Kunstgewerbeschule in Bern and acquired his teaching certificate.
In 1910, he found a studio in Paris and attracted the attention of Félix Vallotton, who suggested that he study figurative drawing.
After a short stay in Munich, he returned to Paris in the winter of 1912/1913 and worked at La Ruche, an artists' residence.
The outbreak of World War I made it impossible to remain in France, so he divided his time between Solothurn and his mandatory military service.