Cottesloe is a western suburb of Perth, Western Australia, within the Town of Cottesloe. Cottesloe was named for Thomas Fremantle, 1st Baron Cottesloe, a prominent Tory politician and the brother of Admiral Sir Charles Fremantle for whom the city of Fremantle was named; the nearby suburb of Swanbourne was named for the Fremantle family seat, Swanbourne House, in Swanbourne, Buckinghamshire. Cottesloe was home to Australian Prime Minister John Curtin; the house he built still stands in Jarrad Street. It is now vested jointly in the National Trust of Curtin University. Cottesloe is a beach-side suburb of the city of Perth in Western Australia, it is located halfway between Perth central business district and the port of Fremantle. It is famous for its beaches and relaxed lifestyle. Cottesloe is bounded by the Indian Ocean to the west. Cottesloe is residential, with a significant shopping area located between Jarrad and Station streets adjacent to the Cottesloe railway station. In the 2016 census, there were 7,375 people in Cottesloe.

68.8% of people were born in Australia. The most common other countries of birth were England 8.6%, South Africa 1.8%, New Zealand 1.6% and United States of America 1.4%. 86.6% of people spoke only English at home. The most common responses for religion were No Religion 36.4%, Anglican 22.6% and Catholic 19.3%. Of the occupied private dwellings in Cottesloe, 66.9% were separate houses, 14.9% were semi-detached, row or terrace houses, townhouses etc. and 18.1% were flat or apartments. Of the employed people in Cottesloe, 7.2% worked in hospitals. Other major industries of employment included legal services 3.6% and general practice medical services 3.0%. The beach and its panorama are reflections of the changes in the last 110 years of Perth's history; the photos and paintings of Cottesloe Beach that are either in collections or published, give tangible evidence of the importance of beach-oriented activities in the Perth community. Cottesloe Beach is a popular place for beach cricket. An oceanway allows cyclists to move along the beaches in a sustainable manner.

In 2009, Lonely Planet named Cottesloe Beach the world's 2nd best beach for families. A new town planning scheme was approved for Cottesloe allowing developers to build to five storeys high along Marine Terrace with the Ocean Beach Hotel site allowed to reach eight storeys; the decision followed a two decade long debate. Cottesloe is served by Swanbourne, Grant Street, Mosman Park and Victoria Street railway stations on the Fremantle line. Various bus routes along Stirling Highway and through the suburb's western and eastern sections link Cottesloe to Perth and Fremantle. All services are operated by the Public Transport Authority. During the summer months, the council provides a free shuttle bus every hour during the day, called the Cott Cat, between Cottesloe train station and the Cottesloe beachfront. In 2004 the service carried over 30,000 passengers, at a cost of $15,000. Cottesloe is part of the federal division of Curtin. From 1901 to 1968 and from 1974 to 1980 it was part of the Fremantle electorate.

Curtin is regarded as a safe seat for the centre right Liberal Party, which has held the seat continually since its inception, with the exception of a period from 1996 to 1998 when former Liberal member Allan Rocher held the seat as an independent. The current member is Celia Hammond. In the parliament of Western Australia, the Legislative Assembly electoral district of Cottesloe is held by David Honey of the Liberal Party. John Curtin, Prime Minister of Australia for much of World War II, was local federal member of parliament from 1928 to 1931 and 1934 to 1945, he lived in Cottesloe from 1918 until his death in office in 1945. Curtin's house in Jarrad Street is vested in the National Trust of Curtin University. During 2008 there was a suggestion that the house be relocated to the Curtin University grounds but the decision was made that the house remain in Cottesloe. In May 2009 the federal government announced that it would provide a grant of $580,000 to the National Trust to restore the house.

Claude de Bernales was a mining entrepreneur who in 1911 bought Attorney-General Richard Pennefather's 1898 Federation Queen Anne house, naming it Overton Lodge. In 1936 it was rebuilt as a 30-room Inter-war Spanish Mission style residence, designed by Bernard Evans, it was bought for £30,000 by the Town of Cottesloe in 1950 and renamed the Cottesloe War Memorial Town Hall and Civic Centre. Former West Coast Eagles premiership player Chris Mainwaring lived in Cottesloe before his death on 1 October 2007. In December 2008 the Town voted to restore the pylon, a concrete structure built in 1935, at a cost of $172,000. Decades of battering by the ocean has eroded the pylon, one of three pylons built to anchor a shark net following a fatal attack in 1925. Two were destroyed by storms in 1937. Since it has become an iconic landmark and popular diving platform for beach users. During major storm activity on 21–22 May 2009, the spike was knocked off the pylon; however this is not the first time. It remained on the bottom of the ocean in 3 metres of water until an unnamed group removed the 800-kilogram structure using nothing but wood and rope.

After the pylon was restored, it was painted in the Cottesloe Surf Lifesaving Club colours, but it was soon changed to the colours of North Cottesloe Lifesaving Club. It has alternated colours many times since. Le Fanu House

The 2017 Betway Premier League Darts was a darts tournament organised by the Professional Darts Corporation – the thirteenth edition of the tournament. The event began on Thursday 2 February at the Metro Radio Arena in Newcastle and ended with the Play-offs at The O2 Arena in London on Thursday 18 May; this is the fourth year. Michael van Gerwen, the 2016 champion, retained his title by winning the last-leg decider against Peter Wright in the final. Kim Huybrechts became the first player in Premier League Darts history to fail to win a match in the tournament; the tournament format is identical to that since 2013. During the first nine weeks each player plays the other nine players once; the bottom two players are eliminated from the competition. In the next six weeks each player plays the other seven players once. Phase 2 consists of four weeks where five matches are played followed by two weeks where four matches are played. At the end of phase 2 the top four players contest the two semi-finals and the final in the play-off week

Lethiscus is the earliest known representative of the Aistopoda, a group of specialised snake-like amphibians known from the early Carboniferous. Lethiscus is known from only a single specimen from the Holkerian Stage of the Early Carboniferous of Scotland, is one of the oldest known post Devonian tetrapods. Despite its early date, it was a advanced animal; the skull is specialised and light like that of Ophiderpeton, with the orbits, far forward, the cheek region unossified. There are 30 spaced teeth on the maxilla and dentary, a sutural pattern of the skull resembles that of the Late Carboniferous aïstopod Oestocephalus. There is no trace of limbs. However, unlike members of the aïstopod lineage, the vertebrae still possess intercentra, the pleurocentra are large. Lethiscus is the only representative of the family Lethiscidae. Owing to its early date, it has since its discovery been considered ancestral to aïstopods, more recent cladistic research confirms its position as the most basal aistopod.

A 2017 cladistic analysis incorporated new data on Lethiscus found all aïstopods, including Lethiscus, to be stem-tetrapods, rendering Lepospondyli polyphyletic. Anderson, Jason S. Carroll, Robert L. and Rowe, Timothy B.. "New information on Lethiscus stocki from high-resolution computed tomography and a phylogenetic analysis of Aistopoda". Can. J. Earth Sci. 40: 1071–1083. Bibcode:2003CaJES..40.1071A. Doi:10.1139/e03-023. CS1 maint: multiple names: authors list Carroll, R. L, Vertebrate Paleontology and Evolution, WH Freeman & Co. pp. 176–7 Wellstead, C. F.. "A Lower Carboniferous aïstopod amphibian from Scotland". Palaeontology. 25: 193–208. Aistopoda - phylogeny