The Big Nickel is a nine-metre (30 ft) replica of a 1951 Canadian nickel, located at the grounds of the Dynamic Earth science museum in Greater Sudbury, Ontario, Canada, and is the world's largest depiction of a coin. The twelve-sided nickel is located on a small hill overlooking the intersection of Municipal Road 55 and Big Nickel Drive at the westernmost end of the Gatchell neighbourhood.

It celebrated its 45th anniversary on July 22, 2009 with a "birthday party" on the grounds of Dynamic Earth, including a display of coins from Science North's Inco Coin Collection.

The idea for it began in 1963 when Ted Szilva, at the time a 28-year-old City of Sudbury fireman, read in the "Sudbury Star" of a contest, sponsored by the Sudbury Canada Centennial Committee, asking Sudbury residents how the City should celebrate the upcoming Canadian Centennial. Szilva put forward the suggestion for a major tourist attraction featuring a giant replica of a five-cent coin.

July 27, 1964, the park was officially opened. Szilva was extremely pleased that John Fisher, the Canadian Centennial commissioner, had accepted his invitation to be on hand to unveil the Big Nickel Monument to a crowd of 1,500. There was extensive media coverage of the event by "The Sudbury Star", "Canadian Coin News", and other Canadian publications as well as television coverage. The Big Nickel developed into a world-renowned landmark, and Sudbury into a northern tourist centre.

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