A Sky Sports panel has compiled a list of 20 of the biggest derbies in British football, but which is your favourite?
Ahead of Derby Day this weekend on Sky Sports - with Manchester United up against Manchester City and Rangers taking the short trip to Celtic - we are asking you to vote up or down on which you believe to be the best, or the least important, geographical rivalries in the game.
From the Dundee derby north of the border, right down to the South Coast derby between Southampton and Portsmouth, we want you to vote up on the rivalry which gets your pulse racing the most.
And if you don't think some of the match-ups on our list should be classed as derbies, don't forget to vote down!
Derby Day gets underway on Sky Sports this Saturday from 11.30am; the Manchester derby coverage is on Sky Sports 1 HD (kick-off 12.30pm), while the Old Firm derby coverage also begins at 11.30am (kick-off midday).
Vote up and down for your favourite derby below...