Hilliger National Park was created as Class A reserve No. 47668 on 30 November 2004 with a size of 16,962 hectares (41,910 acres) as one of nine national parks proclaimed in the state that day.[4][5]
The national park was named after Johannes Hilliger, a former employee of the Forests Department, who died fighting a bushfire at Barlee Brook in 1958. The Wiltshire-Butler National Park, further to the north-west, was named John Francis Wiltshire-Butler for the same reason, having also died fighting the 1958 fire.[6] Four men died in the fire - Robert Henry Johnston, George McCorkill were the other two victims who are memorialised in Nannup.[7][8]