Carrolup is a rural locality of the Shire of Katanning in the Great Southern region of Western Australia. The small Carrolup Nature Reserve is located within Carrolup, on the Carrolup River, which flows through the locality from east to west.

The larger eastern part of the Shire of Katanning, up to Katanning itself, is located on the traditional land of the Koreng people. The smaller western part, west of Katanning, which includes Carrolup, is located on the traditional land of the Kaneang people, with both being of the Noongar nation.

The Carrolup Native Settlement, now referred to as Marribank, is listed on the Western Australian State Register of Heritage Places, but, despite its name, is located west of the current locality, on the Carrolup River, in the locality of Cherry Tree Pool in the Shire of Kojonup.

The Carrolup Agricultural Hall, on the shire's heritage register, dates back to 1902 and has served as a church, school a golf club and a pony club.

The Carrolup Nature Reserve was gazetted on 21 June 1901, has a size of 0.3 square kilometres (0.12 sq mi), and is located within the Avon Wheatbelt and Jarrah Forest bioregions.