The Mueller Glacier is a 13-kilometre (8.1 mi) 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.