The Alexandra Gardens is a 5.2-hectare (13-acre) urban park located on the south bank of the Yarra River, opposite Federation Square and the city centre of Melbourne, in Victoria, Australia.

The Gardens are bounded by the Yarra River to the north, Princes and Swan street bridges, with Queen Victoria Gardens and Kings Domain across Alexandra Avenue to the south. Created in 1901 under the direction of Carlo Catani, Chief Engineer of the Public Works Department, the Alexandra Gardens were named in honour of Alexandra of Denmark, in the year her reign as Queen Consort of the United Kingdom and the British Dominions and Empress consort of India began.

The park is located on the traditional lands of the Wurundjeri Woi-wurung people; and is administered by the City of Melbourne.

Alexandra Gardens is part of a 123-hectare (300-acre) larger area of parklands directly south-east of the city, bounded by the Yarra River, Anderson Street, Domain Road and St Kilda Road, collectively known as the Domain Parklands. In addition to Alexandra Gardens, these parklands also include Alexandra Park, the Kings Domain and Kings Doman South, Queen Victoria Gardens, the Sidney Myer Music Bowl, Melbourne Gardens (Royal Botanic Gardens), Melbourne Observatory, the Shrine of Remembrance Reserve and Government House Reserve.

The Domain Parkland and Memorial Precinct was added to the Australian National Heritage List on 12 February 2018 by the Australian Government in recognition of the Domain's association with Australia's national heritage – in particular, as a place where the Traditional Owners asserted control to ensure the return and (re)burial of their ancestors is in accordance with their cultural protocols. The precinct also demonstrates a rare government domain with strong Victorian era components of significant to the Australian people.

Additionally, the entire Domain Parklands were added to the Victorian Heritage Register on 25 July 2013 by the Government of Victoria in recognition of its historical, archaeological, aesthetic, architectural, scientific (horticultural), and social significance to the State of Victoria.

From the time of European settlement of Melbourne in 1835, the area of the gardens was used for timber cutting, cattle grazing and as a brickmakers' field. Regular flooding occurred until a new channel for the Yarra River was dug from 1896 to 1900 to straighten and widen the river. The spoil was used to fill the swampy lagoons and brickmakers pits and raise the height of the river bank where Alexandra Gardens now stands. Landscaping occurred immediately, and the gardens were planned and laid out for the visit of the Duke of York in May 1901.

The gardens’ palms, ornamental shrubs, rockeries and tree-lined avenues and lawns make this a delightful place to go for a walk. The star-shaped garden bed in the centre of the gardens, designed to represent the Federation of Australia. The gardens are a settling for major events, including the Moomba Festival, Midsumma Festival, and New Year's Eve celebrations.