Dianella is a suburb of Perth, Western Australia. It is within the local government area of the City of Stirling.
Dianella was named after the botanical title of a small blue lily, Dianella revoluta, which is a narrow-leafed plant which was plentiful in the area prior to residential development.
Early development of the area was slow, as the sandy soil, part of the Banksia sandplain, was considered unsuitable for agriculture. Much of Dianella was subdivided in the 1880s by the Intercolonial Investment Company of Sydney, but growth was still slow and by 1919, the only development was along Walter Road, a track leading to dairy farms in the Morley area. Dianella comprised localities known as North Inglewood, East Yokine, Morley Park and Bedford Park. They were amalgamated into Dianella in 1958, which generated some growth.
Development progressed during the 1960s and housing construction first occurred north from Walter Road and Grand Promenade, with St Andrews, Montclair Rise and Dress Circle Estates being the last major areas to be developed in the early 2000s. The character of housing ranges from modest post-war homes to large, modern two storey dwellings.
Dianella was Perth and Western Australia's media centre; with three of Perth's major commercial television stations based there until Channel 7 relocated to Osborne Park in 2015. Channel 9 and Channel 10 also left the suburb in 2016 and are now relocated to St Georges Terrace and Subiaco, respectively.
There are a number of small parks in Dianella and a large regional open space.