Middlesbrough F.C. with supporters' clubs across the globe. The largest supporters' clubs include the Official Supporters' Club, the Middlesbrough Disabled Supporters' Association, Yarm Reds, Red Faction and Middlesbrough Supporters South. Middlesbrough supporters' main rivals are Sunderland (with whom they contest the Tees–Wear derby), Newcastle United (with whom they contest the Tyne–Tees derby), and Leeds United, a fact confirmed by planetfootball.com's 2004 survey. Carlisle United see Middlesbrough as their biggest rivals, but Middlesbrough supporters have not reciprocated, as they do not see Carlisle as a top three rival. The nickname "Smoggies" was first used as a derogatory term by opposing supporters; it relates
Middlesbrough F.C. faces the main West stand. The current stadium capacity as of the 2017–18 season is 34,000. Average attendances at Middlesbrough matches have fluctuated over the past several years, moving from a 2004–05 high average of 32,012 to a low of 26,092 in 2006–07, then up again to 28,428 in 2008–09. Following relegation to the Championship, attendances dipped, although the crowd of 23,451 which saw Middlesbrough's first Championship game against Sheffield United represents far higher gates than is usual for the division, and indeed larger than those of some Premier League clubs. The club attracted an average of 24,627 for their