Castle Golf Club occupies elevated parkland in Rathfarnham, on the southern outskirts of Dublin, with views extending across the city toward Dublin Bay and the Wicklow Mountains. The course was designed by Harry Colt and opened in 1913, representing one of his several Irish commissions during a period when he was establishing his reputation as a strategic architect. The property's natural contours and mature tree cover provide the framework for Colt's routing, which moves across rolling terrain and incorporates subtle changes in elevation throughout the round. The layout features Colt's characteristic emphasis on positioning and angles rather than overwhelming length. Greens are typically well-bunkered and contoured to reward precise approach play, while fairways often present options for different lines of attack depending on pin placement. The routing takes advantage of the site's topography, with several holes playing along ridges or through valleys framed by established woodland. The par threes vary in length and character, and the closing stretch includes strong two-shot holes that test accuracy and course management. Castle Golf Club has hosted numerous national amateur championships and remains a regular venue for Irish domestic competition. The club maintains a traditional members' culture, and the course is regarded as one of the more testing parkland layouts in the Dublin area. Its combination of Colt's design principles and mature parkland setting gives it a character distinct from the links courses that dominate Irish golf's international reputation.