A supporter liaison officer (SLO, sometimes also supporters liaison officer or supporters' liaison officer) is a person within an association football club (or another sports club) functioning as a bridge between the club itself and supporters of the club. The SLO builds relations with the club management and the fans through two-way communication, informing supporters about decisions made by the club and informing the club about the fan's point of view. The SLO also works with security and police as well as the SLOs of other clubs to ensure that relevant knowledge is spread to all organisations participating in matches and other events of the club.