St Just in Penwith (Cornish: Lannust)[1] was an electoral division of Cornwall in the United Kingdom which returned one member to sit on Cornwall Council between 2009 and 2021.

It was abolished at the 2021 local elections, being succeeded by the Land's End division.

The division represented the town of St Just, the villages of Pendeen, Boscaswell, Trewellard, and Botallack as well as the hamlets of Carnyorth, Higher Boscaswell, Tregeseal and Kelynack.

The division also included Land's End Airport.

[2] The division was nominally abolished during boundary changes at the 2013 election.