Hans Larwin was a Viennese genre painter and academician.
Larwin was the son of bookbinder Johann Larwin and his wife Karoline (née Veihinger). He attended at a Kunstgewerbeschule (Austrian vocational arts school) in Vienna and studied from 1889 at the Academy of Fine Arts. He studied under such artists as Christian Griepenkerl in 1891, from 1893 with August Eisenmenger and from 1894 with Kazimierz Pochwalski.

Around 1900, Larwin undertook numerous study trips to Rome, Munich, Paris, and the Netherlands. In 1902 he became a member of the Vienna Künstlerhaus gallery, and had his first exhibitions there. He was also a member of the "Alte Welt" artists' association. During World War I, he was involved as an official war painter on various fronts for the Austria-Hungary dual monarchy.

After a stay in Chicago (1922–24) Larwin lived between 1925 and 1927 in Slovakia, Hungary, and Yugoslavia. In 1927 he returned to Vienna, where he became professor and director of the general painting school at the Vienna Academy of Fine Arts in 1930. He also taught at the Higher Graphic Federal Institute of Education and Research [de].

His patron was Jenny Mautner (1856–1938) and her husband, Isidor Mautner [de] (1852–1930), the owners of the Marienthal textile factory [de] since 1925.

His grave is located at the Vienna Central Cemetery.