London Irish RFC was a professional rugby union club, currently in administration, which competed in the Premiership, the top division of English rugby union. The club had also competed in the Anglo-Welsh Cup, the European Champions Cup and European Challenge Cup. While playing in the Championship in 2016–17 and 2018–19, it also played in the British and Irish Cup and RFU Championship Cup. The club played home games at the Madejski Stadium in Reading, Berkshire for twenty years, before moving for the 2020–21 season to the Gtech Community Stadium in Brentford, West London.

The Avenue was a rugby union stadium and training pitches in Sunbury-on-Thames that belonged to the English club London Irish since 1931 when the team bought its 11 acres (4.5 ha). The team moved one season to the Stoop Memorial Ground thereafter to Madjeski Stadium, from 2000. For 14 more years the club kept The Avenue as its training and pre-season friendlies ground as well as Aviva A League matches. In 2014 the club began to train at its replacement, larger Hazlewood facility in the same town, including its Academy and hosting international training when Twickenham stadium hosts such tournaments and the grounds were converted to landscaped suburban housing, a sports/leisure club and care home.