Between them, Celtic and Rangers have won 23 Scottish Premiership titles, 17 Scottish Cups, 18 League Cups and both have made the final of the UEFA Cup since the turn of the century - as well as Rangers’ recent run to the Europa League final.
Yes, there’s been some dark days for both Old Firm sides in the past 24 years but also the abundance of quality, talent and skill that have walked in and out of the doors is almost unprecedented. Both sides of the divide have their favourites - but which players would make the ultimate Old Firm XI?
What do you think is the best combined Old Firm starting XI since the turn of the century? Do you agree with our picks?
17. Sub: Shunsuke Nakamura
That free kick against Manchester United will live long in the memory. The Japanese attacking midfielder was superb in Glasgow, winning five trophies during his time at Celtic and was named SFWA Footballer of the Year in 2007. | Getty Images Photo: Getty Images
18. Sub: Stefan Klos
An outstanding goalkeeper that was inches away from being the number one in this team. | Getty Images Photo: Getty Images