Linfield Football Club is a semi-professional football club based in Belfast, Northern Ireland, which plays in the NIFL Premiership – the highest level of the Northern Ireland Football League. The club was founded in 1886 as Linfield Athletic Club and in 1905 moved into their current home of Windsor Park, which is also the home of the Northern Ireland national team. The club's badge displays Windsor Castle, in reference to the ground's namesake. Historically, Linfield's main rival has been Glentoran with whom they contest the Big Two derby. This rivalry traditionally includes a league derby played on Boxing Day each year, which usually attracts the largest league attendance of the season. Linfield's average league home attendance is approximately 2,500, the highest in the division and more than double the league's overall average of about 1,000.
The Blues are managed by former Northern Ireland international and current all-time record goalscorer, David Healy. Healy was appointed on 14 October 2015 to succeed Warren Feeney, who had resigned in order to become assistant manager of Newport County.
Linfield holds several domestic records and even a world record.
National Football Stadium at Windsor Park