Brian Clough of course famously managed both clubs, while his son Nigel wrote his name into the history books at Forest before going on to manage the Rams.
Clough isn’t the only man to have occupied the hotseat at both clubs with Billy Davies and Steve McLaren also joining that small club.
Like Clough jnr, Colin Addison played for Forest before managing Derby, while Mick Harford did it in the opposite order.
There’s also been plenty of players who have played for both clubs down the years – perhaps more than you think.
So with that in mind, here are just some who have crossed the big East Midlands divide.
13. Mikkel Beck
Beck joined Derby from Middlesbrough in the 1999/2000 season but failed to settle. He joined Forest on loan from Derby in November 1999 and played five times before being recalled early. Photo: Getty Images
14. Gary Charles
Gary Charles played 81 times for Forest between 1987 and 1993, including in the FA Cup final defeat to Spurs. On 29 July 1993, he made a £750,000 move to Derby County, appearing 76 times for them during a two-year spell, which included honours for PFA Team of the Year in 1993–94. Photo: Getty Images
15. Kris Commons
Kris Commons joined Nottingham Forest on 1 July 2004 and went on to play 138 times for the club. He joined Derby in June 2008 before earning a glamour move to Celtic. Photo: Getty Images
16. Steve Hodge
Steve Hodge (r) was born in Nottingham and joined his boyhood club Nottingham Forest as an apprentice in 1980. He went on to make 123 appearances before joining Aston Villa. He returned for a second spell at Forest between 1988 and 1991 where he won the Full Members Cup and the League Cup. He had a brief 10 game loan spell at Derby, from Leeds, in 1994. Photo: Getty Images