老字号（英语：Old Firm）是苏格兰格拉斯哥市两支班霸球队些路迪及格拉斯哥流浪的共同称号，原意暗指两会经常独断独行，往往违背其他球队的意愿，互相串通谋取利益，最佳例证是两队常常提出脱离苏超而希望加入英超作赛。

老字号可说是完全垄断苏格兰足球，合共包揽66次苏格兰杯及94次顶级联赛冠军。挑战两队的皇权不常出现，最近是1980年代初的鸭巴甸及登地联。老字号结合庞大的支持力量，加上连年霸占出席欧洲比赛的参赛席位而增加收入，使到苏超资源分配严重失衡，两队所得远超过其他苏格兰的球队，苏超比赛竞争越来越小，最近一次老字号齐齐跌出苏超头两名之外已是1984-85年赛季。

The Old Firm is the collective name for the Scottish football clubs Celtic and Rangers, who are both based in Glasgow. The origin of the term is unclear but may derive from the two clubs initial match in which the commentators referred to the teams as "like two old, firm friends", and represents the commercial benefits of the two clubs' rivalry. The name may also be a reference to these two teams being among the original 11 members of the Scottish Football League formed in 1890. The rivalry between the two clubs has become deeply embedded in Scottish culture and has contributed to the political, social and religious division in Scotland and also beyond, especially in neighbouring Northern Ireland. As a result, the fixture was recognised as having enduring appeal.