Luna Park Sydney (originally Luna Park Milsons Point, also known as Sydney's Luna Park) is an amusement park, in Sydney, New South Wales, Australia. Luna Park is located at Milsons Point, on the northern shore of Sydney Harbour.

The park was constructed at the foot of the Sydney Harbour Bridge during 1935, and ran for nine-month seasons until 1972, when it was opened year-round. Luna Park was closed in mid-1979, immediately following the Ghost Train fire, which killed six children and one adult. Most of the park was demolished, and a new amusement park was constructed; this originally operated under the name of Harbourside Amusement Park before resuming the Luna Park name. The park was closed again in 1988 as an independent engineering inspection determined that several rides needed urgent repair. The owners failed to repair and reopen the park before a New South Wales government deadline, and ownership was passed to a new body. Reopening in 1995, Luna Park closed again after thirteen months because of the Big Dipper rollercoaster: noise pollution complaints from residents on the clifftop above the park caused the ride's operating hours to be heavily restricted, and the resultant drop in attendance made the park unprofitable. After another redevelopment, Luna Park reopened in 2004, and as of 2011 is still operating.

Sydney ( /sɪdni/) is the most populous city in Australia and the state capital of New South Wales. Sydney is classified as an Alpha+ World City indicating its influence in the region and throughout the world.

Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people. Inhabitants of Sydney are called Sydneysiders, comprising a cosmopolitan and international population.

The site of the first British colony in Australia, Sydney was established in 1788 at Sydney Cove by Arthur Phillip, commodore of the First Fleet as a penal colony. The city is built on hills surrounding Port Jackson which is commonly known as Sydney Harbour, where the iconic Sydney Opera House and the Harbour Bridge feature prominently. The hinterland of the metropolitan area is surrounded by national parks, and the coastal regions feature many bays, rivers, inlets and beaches including the famous Bondi Beach and Manly Beach. Within the city are many notable parks, including Hyde Park and the Royal Botanic Gardens.

Luna Park is a name shared by dozens of currently operating and defunct amusement parks that have opened on every continent except Antarctica since 1903.

The first to use the name was the second major amusement park at Coney Island, designed by Charles I.D. Looff, who subsequently designed Seattle, Washington's Luna Park, which opened in 1907. The spaceship in the Pan-American Exposition ride "A Trip to the Moon" gave its name to these parks... and to dozens that followed over the next century.

In 1905, Frederick Ingersoll was already making a reputation for his pioneering work in roller coaster construction and design (he also designed scenic railroad rides) when he opened Luna Parks in Pittsburgh and Cleveland, the first two amusement parks to be covered with electric lighting (the former was adorned with 67,000 light bulbs; the Cleveland park had 50,000). Ultimately he opened 44 Luna Parks around the world, the first chain of amusement parks.

Despite the death of Ingersoll in 1927 and the closing of most of his Luna Parks, the name's popularity continued with newer parks with the name opening with regularity. As a result, "Lunapark" now translates into "amusement park" in Bulgarian, Croatian, Dutch, German, Greek, Hebrew, Italian, Macedonian, Polish, Russian, and Turkish.