Two inter-club competitions are held annually. The team to represent Castle is selected by the Bridge Committee taking into accounts attendance and results at the weekly competitions. These competitions are:
Team of Four
Played against Grange Golf Club and consisting of 32 players from each club. The clubs alternate hosting of the event, in the first quarter of each year. The 2015/6 event was held in Castle with Grange taking the honours.
The Rose Bowl was inaugurated in 1991. The event is also held in the first quarter of the year.
Participating clubs are: Milltown, Elm Park, Grange, Rathfarnham, Dun Laoghaire, Edmonstown and Castle. Hosting of the event is rotated among the participating clubs, the 2016 event was hosted by Elm Park, with Dun Laoghaire wining for the first time in the competitions history.