Glen Waverley is an eastern suburb of Melbourne, Victoria, Australia, located 19 km (12 mi) southeast of the Melbourne central business district. It is the council seat of the City of Monash local government area and a prominent suburban commercial district, as well as a local transport hub as the interchange between the Glen Waverley line terminus and the upcoming SRL East ring line. Glen Waverley recorded a population of 42,642 at the 2021 census.

The area was first settled in the mid nineteenth century and later developed as orchards and farming lands. The Post Office opened on 1 July 1885 as Black Flat in the area to the south of the railway line, was renamed 'Glen Waverley' in 1921, and Glen Waverley South in 1963 on the same day. Glen Waverley North office (open since 1954) was renamed Glen Waverley (from 1994 The Glen). The name "Waverley" comes from a novel by Sir Walter Scott.

Major development occurred in the 1950s to 1970s with rapid infilling of housing built to a generally high standard on large (typically 800m²) blocks. In particular Legend Park Estate was opened by Hooker Rex in 1971. Much of that housing stock is now ageing and renewal is occurring, frequently involving subdivision of the larger blocks into townhouse development. The suburb was also the site of Victoria's first McDonald's restaurant, which opened on 12 September 1973, at the corner of High Street and Springvale Road. It was opened shortly after the original in Sydney. Following the Sydney McDonald's closure, it became Australia's longest surviving McDonald's until it was demolished in 2016, and subsequently replaced with a modernised version.

One of the largest suburbs in Melbourne by land area, Glen Waverley is bounded by the Dandenong Creek and Jells Park to the east, Waverley Road and View Mount Road to the southeast, Ferntree Gully Road to the south, Blackburn Road to the west and Highbury Road to the north. Springvale Road, a major north–south arterial, divides the suburb into two asymmetrical halves. The geography varies from river flats adjacent to the Dandenong Creek in the east to the hilly region between the Dandenong Creek and the Scotchmans Creek (a small first-order tributary of the Yarra River) catchments.

Glen Waverley is home to the only commercial district within its local government area that is north of the Monash Freeway, a suburban region which accounts for more than half of the City of Monash's administrative area. Most of its shopping centres are streetside retail stores and restaurants along and around Kingsway and the Glen Waverley railway station. The Glen Shopping Centre, located at southwestern corner of the junction between Springvale Road and High Street Road, is the eleventh-largest shopping mall in Victoria.

Glen Waverley has also developed to become somewhat of a business hub in metropolitan Melbourne, with many international companies including Toshiba, Ansell, and NEC all having their Australian headquarters in the suburb.

Nicknamed the "Centre of the Universe" (Chinese: "宇宙中心") by the local Chinese Australian residents due to its convenient location and transportation, ample amenities, high-quality schooling, relatively good weather and favourable living conditions, Glen Waverley had the seventh highest number of AUD $1,000,000+ house sales in Melbourne in 2013. Properties in Glen Waverley and surrounding areas continued to show price gains in 2014 and 2015, largely due to interest from Chinese property buyers.

At the 2021 census, Glen Waverley had a population of 42,642. 38.0% of people were born in Australia. The next most common countries or regions of birth were China (excludes SARs and Taiwan) 17.8%, India 8.0%, Malaysia 5.6%, Sri Lanka 5.3% and Hong Kong SAR 2.5%. 35.6% of people spoke only English at home. Other languages spoken at home included Mandarin 23.3%, Cantonese 8.0%, Sinhalese 4.0%, Tamil 3.0% and Hindi 2.7%. The most common responses for religion were No Religion 37.5%, Catholic 11.7%, Buddhism 10.4% and Hinduism 9.8%.