Dianella is a suburb of Perth, Western Australia, located approximately 12km north-east of the Perth central business district. It is part of the City of Stirling local government area. The suburb is bounded by Alexander Drive to the north, Morley Drive to the east, Beechboro Road North to the south and the Mitchell Freeway to the west.

The suburb is named after the blue flax lily (Dianella caerulea), which is found in the area. The suburb was developed in the late 1960s and early 1970s. It is a residential suburb with a mix of single and double storey dwellings. The suburb also contains a small shopping centre, a primary school, a public library, a medical centre and a number of parks and reserves.