The Mueller Glacier is a 13km long glacier flowing through Aoraki/Mount Cook National Park in the South Island of New Zealand. It lies to the south of Aoraki/Mount Cook, high in the Southern Alps, and flows north. Its meltwaters eventually join the Tasman River.
The glacier was named after German-Australian botanist and explorer Baron von Mueller.
Based on dating of a yellow-green lichen of the Rhizocarpon subgenus, Mueller Glacier is considered to have had a Little Ice Age maximum mass between 1725 and 1730.