Acacia kingiana was a species of wattle that occurred in an area north east of Wagin in the Avon Wheatbelt region of south-west Western Australia. It has been declared extinct under Australia's Environment Protection and Biodiversity Conservation Act 1999, and Western Australia's Wildlife Conservation Act 1950. The species was described by Joseph Maiden and William Blakely in 1928. They described the species as a bushy shrub 2–3 metres (6 ft 7 in–9 ft 10 in) tall, with 10-millimetre (0.39 in)-long, 2-millimetre (0.079 in)-wide phyllodes, and yellow flowers. It grew in gravelly soil.