Cheltenham is a suburb of Sydney, in the state of New South Wales, Australia. Cheltenham is 21 kilometres north-west of the Sydney central business district in the local government area of Hornsby Shire. Cheltenham is considered to be part of the Northern Suburbs.

This residential suburb has a distinctive English atmosphere, with a number of 19th Century mansions on tree-lined streets. Cheltenham shares its postcode of 2119 with Beecroft and has sometimes been viewed as simply part of that suburb. Most residents of Cheltenham see themselves as distinct from Beecroft, although local issues are addressed together in the Beecroft Cheltenham Civic Trust.

Cheltenham takes its name from a house built by William Chorley, a Sydney tailor and men’s outfitter, who acquired the land when it was released from the Field of Mars Reserve. He named the house after his birthplace of Cheltenham, Gloucestershire, England. Chorley asked the government to build a station here and to name it after his property when it opened in 1898. Sutherland Road was named for John Sutherland, Minister for Public Works from 1887 to 1889.

According to the 2011 census, there were 2,067 residents in Cheltenham. 70% or residents were born in Australia; the most common ancestries in Cheltenham were English 26.4%, Australian 23.0%, Chinese 9.9%, Irish 8.4% and Scottish 8.0%. The median age was 43 years, six years older than the national median of 37. Children aged under 15 made up 18.5% of the population and people aged 65 and over made up 15.5% of the population. The median weekly household income in Cheltenham was $2,568, more than double the national median weekly income of $1,234. The most common religious affiliation was "No Religion".

Cheltenham railway station is on the on North Shore, Northern & Western Line of the Sydney Trains network. It is one of the few stations with no surrounding business district, due to William Chorley placing covenants on the surrounding land.

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