Greyfriars Bobby (4 May 1855 – 14 January 1872) was a Skye Terrier who became known in 19th-century Edinburgh for spending 14 years guarding the grave of his owner until he died himself on 14 January 1872. The story continues to be well known in Scotland, through several books and films. A prominent commemorative statue and nearby graves are a tourist attraction.

The best-known version of the story is that Bobby belonged to John Gray, who worked for the Edinburgh City Police as a nightwatchman. When John Gray died he was buried in Greyfriars Kirkyard, the kirkyard surrounding Greyfriars Kirk in the Old Town of Edinburgh. Bobby then became known locally, spending the rest of his life sitting on his master's grave.

In 1867 the Lord Provost of Edinburgh, Sir William Chambers, who was also a director of the Scottish Society for the Prevention of Cruelty to Animals, paid for Bobby's licence and gave the dog a collar, now in the Museum of Edinburgh.

Bobby is said to have sat by the grave for 14 years. He died in 1872 and a necropsy by Prof Thomas Walley of the Edinburgh Veterinary College concluded he had died from cancer of the jaw.

He was buried just inside the gate of Greyfriars Kirkyard, not far from John Gray's grave.

A year later, the English philanthropist Lady Burdett-Coutts was charmed by the story and had a drinking fountain topped with Bobby's statue (commissioned from the sculptor William Brodie) erected at the junction of George IV Bridge and Candlemaker Row (opposite the entrance to the churchyard) to commemorate him.

The people of Edinburgh consider the statue as an admirable attraction and source of pride in their City.

Several books and films have since been based on Bobby's life, portraying the themes of hope and loyalty, including the novel Greyfriars Bobby (1912) by Eleanor Atkinson and the films Greyfriars Bobby (1961) and The Adventures of Greyfriars Bobby (2006).

The Greyfriars Bobby Fountain in Edinburgh includes a life-size statue of Greyfriars Bobby created by William Brodie in 1872. It was paid for by a local aristocrat, Baroness Burdett-Coutts, and unveiled on 15 November 1873. It stands near the south (main) entrance to Greyfriars Kirkyard. The monument is Edinburgh's smallest listed building. Originally built as a drinking fountain, it had an upper fountain for humans and a lower fountain for dogs. Its water supply was cut off (together with Edinburgh's other drinking fountains) around 1957 amidst health scares. Both basin areas were infilled with concrete soon afterwards. It was daubed with yellow paint, allegedly by students, on general election night in 1979, and hit by a car in 1984. The monument was fully restored under the supervision of Edinburgh District Council in 1985. The entire base is newly carved but emulates the original exactly. A plaque on the base reads, "A tribute to the affectionate fidelity of Greyfriars Bobby. In 1858, this faithful dog followed the remains of his master to Greyfriars Churchyard and lingered near the spot until his death in 1872. With permission erected by the Baroness Burdett-Coutts". Inscribed on the statue is "Greyfriars Bobby, from the life just before his death" and "W.H. Brodie Sc RSA 1872".

A plaque on the site of a tavern where Bobby was a welcome visitor A red granite monument was erected close to Bobby's grave by The Dog Aid Society of Scotland and unveiled by the Duke of Gloucester on 13 May 1981. Since around 2000 this has been treated like a shrine, with sticks (for Bobby to fetch) frequently left, and occasionally dog toys, flowers, etc. The monument reads, "Greyfriars Bobby – Died 14 January 1872 – Aged 16 years – Let his loyalty and devotion be a lesson to us all".