Dain City is a small suburb at the southernmost part of Welland, Ontario, Canada.

In September 2008, John Deere announced it would be close its plant with a loss of 800 jobs and relocate to Wisconsin and Mexico by the end of 2009.

The completion of the Welland By-Pass in 1973, a massive six-year excavation project to by-pass the whole city of Welland with a wider and straighter channel, significantly altered and isolated Dain City, turning it into a peninsula with the new canal on its eastern side and the old and new canals meeting at its southern tip.

The old canal, renamed the Welland Recreational Waterway, hosts international rowing regattas and dragon boat races annually, and also the South Niagara Rowing Club, which is affiliated with area high schools.

Technically, both the east side of Welland and Dain City are peninsulas, surrounded by the waters of the old and new channels of the Welland Canal and connected to "solid" ground only by the relatively small plug in the old canal along the Townline Tunnel approaches.