Hermina (Mina) Arndt (18 April 1885 – 22 December 1926) was a New Zealand painter.
Arndt was born at Thurlby Domain, near Queenstown in 1885. As a girl, Arndt's family moved to Dunedin where she attended Otago Girls' High School. In 1906, Arndt was living in London studying under Frank Brangwyn at the London School of Art in Kensington. Soon after, Arndt became involved with the Newlyn School, and worked with Stanhope Forbes, Laura and Harold Knight. Later, Arndt showed at the Royal Academy and in Paris at the Société des Artistes Français. In 1914, after being briefly interned in Germany after the outbreak of World War II, she returned to New Zealand permanently. She married Lionel Manoy in Wellington on 14 February 1917, and the couple had one son. Arndt died suddenly in 1926 of nephritis.