The Old Course at St Andrews, also known as the Old Lady or the Grand Old Lady, is considered the oldest golf course in the world. It is a public course over common land in St Andrews, Fife, Scotland and is held in trust by the St Andrews Links Trust under an act of Parliament. The Royal and Ancient Golf Club of St Andrews clubhouse sits adjacent to the first tee, although it is but one of many clubs that have playing privileges on the course, along with some other non-clubhouse owning golf clubs and the general public. Originally known as the "golfing grounds" of St Andrews, it was not until the New Course was opened in 1895 that it became known as the Old Course.

A golf course is the grounds on which the sport of golf is played. It consists of a series of holes, each consisting of a tee box, a fairway, the rough and other hazards, and a green with a cylindrical hole in the ground, known as a "cup". The cup holds a flagstick, known as a "pin". A standard round of golf consists of 18 holes, and as such most courses contain 18 distinct holes; however, there are many 9-hole courses and some that have holes with shared fairways or greens. There are also courses with a non-standard number of holes, such as 12 or 14.