Monocentropus balfouri is a tarantula in the Monocentropus genus. It was first described by Reginald Innes Pocock in 1897. The species is also called Socotra Island blue baboon tarantula, usually shortened to blue baboon tarantula. The scientific name refers to the collector Isaac Bayley Balfour. The Spider is found on Socotra Island, hence the common name. This tarantula is terrestrial and an opportunistic burrower. Like many tarantulas, M. balfouri can be kept as a pet, although it is not a beginner species.