Wagga Wagga (pronounced wogga wogga; , informally called Wagga) is a city in New South Wales, Australia. Straddling the Murrumbidgee River, Wagga with an urban population of 44,272 people, is the state's largest and the country's fifth largest inland city, as well as an important agricultural, military, educational and transport hub of Australia. The city is located midway between the two largest cities in Australia, Sydney and Melbourne, and is the major regional centre for the Riverina and South West Slopes regions.

The central business district is focused around the commercial and recreational grid bounded by Best and Tarcutta Streets and the Murrumbidgee River and the Sturt Highway. The main shopping street of Wagga is Baylis Street which becomes Fitzmaurice Street at the northern end. The city is located in an alluvial valley and much of the city has a problem with urban salinity. Wagga Wagga has four distinct seasons, with warm to hot summers and cold winters by Australian standards. Mean annual rainfall in Wagga Wagga in 557.5 millimetres and is distributed evenly over the twelve months.

The original inhabitants of the Wagga Wagga region were the Wiradjuri people. In 1829, Charles Sturt became the first European explorer to visit the future site of the city. Squatters arrived soon after, leading to conflict with the indigenous inhabitants. The town, positioned on the site of a ford across the Murrumbidgee, was surveyed and gazetted as a village in 1849 and the town grew quickly after. In 1870, the town was gazetted as a municipality.

During the negotiations leading to the federation of the Australian colonies, Wagga Wagga was considered as a potential capital for the new nation. During World War I the town was the starting point for the Kangaroo recruitment march. The Great Depression and the resulting hardship saw Wagga Wagga become the centre of a secession movement for the Riverina region. Wagga Wagga became a garrison town during World War II with the establishment of a military base at Kapooka and Royal Australian Air Force bases at Forest Hill and Uranquinty. After the war, Wagga Wagga was proclaimed as a city in 1946 and new suburbs were developed to the south of the city. In 1982 the city was amalgamated with the neighbouring Kyeamba and Mitchell Shires to form the City of Wagga Wagga local government area.

Wagga Wagga is the seat of a Roman Catholic diocese, with its principal church being St Michael's Cathedral.