John Breckin (born 27 July 1953 in Sheffield, England) is an English footballer who played as a left-back. He is the uncle of Nottingham Forest defender Ian Breckin.
Breckin began his career at Rotherham United and would become a stalwart of the side in the 70s and early 80s at left-back, winning promotion from the Fourth Division in 1975 and from the Third in 1981. He would later play for Bury, Doncaster Rovers and Burton Albion, having also had a loan spell at Darlington early in his career. He also briefly managed Rotherham United in 1987. He has been the Millers assistant manager in two separate spells, from 1997-2005, alongside former team-mate Ronnie Moore, and 2007–09 alongside Mark Robins. He is well loved by the Rotherham fans, and he also holds a Midnight Memory Walk every year for charity.
In September 2009 John followed Mark Robins to Barnsley FC to work there as his assistant. The success they had at Rotherham has continued for the duo as their first 3 months saw Barnsley shoot up the Championship table.