Arnica mollis is a North American species of arnica in the sunflower family, known by the common name soft arnica, or hairy arnica. It is native to Canada (British Columbia, Alberta, Quebec, and all 3 Arctic territories) and the United States (Alaska and the western mountains as far south as San Bernardino County, California and Rio Arriba County, New Mexico. There are also isolated populations in the White Mountains of Coos County, New Hampshire. The species grows in subalpine mountain habitat such as meadows and streambanks. "Mollis" means "soft", referring to the soft hairs on the leaves.