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.
17. Tom Ince
Tom Ince made six loan apperances for Forest in 2014, before an 18 game loan spell at Derby followed in 2015 during his time with Hull City. Photo: Getty Images
18. Russell Hoult
Hoult signed for Derby County in the summer of 1995, joining for a fee of £200,000. He went on to help them win promotion to the Premiership in 1996. Hoult remained with the club until January 2000. He played eight times for Forest while on loan from WBA in 2005. Photo: Getty Images
19. Dean Saunders
Dean Saunders was sold to Derby County for £1 million on 28 October 1988. He scored 42 goals in 106 games before joining Liverpool. Saunders spent one season at Galatasaray, before he returned to the Premier League with Nottingham Forest in 1996 for £1.5m - a season which led to relegation. Photo: Getty Images
20. Nathan Tyson
In November 2005, Tyson joined League One side Nottingham Forest on loan until January, at which point he signed a permanent deal with the club for a fee of £675,000. He helped win Forest promotion from League One in 2007/08. He moved to Derby and played 39 times for the club between 2011 and 2013. Photo: Getty Images