Giorgio Chinaglia (Italian pronunciation: [ˈdʒordʒo kiˈnaʎʎa]; 24 January 1947 – 1 April 2012) was an Italian footballer who played as a striker. He grew up and played his early football in Cardiff, Wales, and began his career with Swansea Town in 1964. He later returned to Italy to play for Massese, Internapoli and S.S. Lazio in 1969. Chinaglia led Lazio to the club's first league championship in the 1973–74 season, during which he was also the league's leading scorer. He played international football for Italy, making 14 appearances and scoring 4 goals between 1972 and 1975, including two appearances at the 1974 FIFA World Cup. Chinaglia was the first player in Italian football history to be called up internationally from the second division.

In 1976, Chinaglia left Lazio to sign with the New York Cosmos of the North American Soccer League. With the Cosmos team that also featured Pelé and Franz Beckenbauer, Chinaglia won four league titles, and retired in 1983 as the NASL's all-time leading goal scorer with 193 goals. In 1980 Chinaglia scored a record 50 goals in regular- and post-season play, plus another 26 in friendly matches. In all matches played, including friendly, exhibition and pre-season games, Chinaglia scored 734 goals, giving him a lifetime average of a goal a game.

In 2000, Chinaglia was inducted into the National Soccer Hall of Fame in the United States and was named the greatest player in Lazio's history during the club's centenary celebrations; with 29 goals, he is also the highest-scoring Lazio player in international competitions. A prolific goalscorer, some sources state that he is the highest scoring Italian player in all professional competitions, with 398 goals, ahead of Silvio Piola, although this claim is also disputed, as the NASL did not abide to certain FIFA regulations at the time. He is also the Italian player with the best goalscoring ratio in domestic championships, with 319 goals scored in 429 league matches played across both Italy and the United States.

Chinaglia was given the nickname "Long John", a reference to Chinaglia's physical style of play, as well as his resemblance to the similarly large Welsh footballing legend John Charles who also played in Italy and Wales.

Chinaglia was born in Carrara, Tuscany in 1947, but in 1955, he moved to Cardiff, Wales with his father Mario, mother Giovanna and his sister Rita, because of unemployment in Italy following World War II. Because his family was poor, Chinaglia said, "All four of us lived in one room," he says, "My father was an ironworker and it was tough. I used to take the milk left on people's porches and drink it for breakfast." Chinaglia, whilst living in Cardiff, attended St Mary's of The Angels Catholic Primary School for an unknown period.

At age 13, Chinaglia was spotted scoring a hat trick for Cardiff Schools, and joined Swansea Town in the Football League Third Division as an apprentice in 1962.

Chinaglia made his senior debut for Swansea in October 1964 at Rotherham United, with his League debut following in February. His final Swans appearance was in March 1966, coming on as a substitute against Brentford.

With Swansea, Chinaglia won the 1965 West Wales Senior Cup, scoring in the 3–0 victory in the final against Llanelli, and represented the Swansea Senior Association Football League in 1964 in a representative match against the Birmingham & District Works Football Association.