Mount Arrowsmith is the highest mountain east of Port Alberni on Vancouver Island.

The mountain is contained within the Mount Arrowsmith Biosphere Region and as of September 18, 2009 is designated part of 1,300 ha (3,200 acres) hectare Mt.

The mountain is named kał-ka-č’ałḥ (Kulth-ka-choolth) meaning Jagged Points Facing Upward in the Tseshaht Nuu-chah-nulth languages.

[2][3] The first recorded ascent by colonists was made by botanist John Macoun in 1887 led by local Indigenous guide Qualicum Tom and his son James Thomas.

The leeward, east-facing slopes are warmer thanks to more sunshine, and all zone boundaries are higher by 50 m (160 ft).