St. Augustine's High School, established in 1969, is a Roman Catholic secondary school serving the west of Edinburgh, Scotland, with approximately 840 pupils.

St. Augustine's RC High School was founded in August 1969. It was created on the Comprehensive School model by the merger of two existing Catholic schools: Holy Cross Academy, a selective secondary school which was established in 1907, and the non-selective St Andrew's Junior Secondary, which opened in 1962. St Augustine's moved to its present site serving the whole of the west of the city in August 1969.

The new school is named after St Augustine of Hippo.

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St Augustine's moved onto a shared campus with Forrester High School in January 2010. The new building is situated on the former football pitches of the school. The new building is split into two halves. On the side closest to Saughton Park is Forrester High School. On the opposite side is St Augustine's with the only shared area being the swimming pool. This is shared on a Rota basis and the students are never taught in the same area at the same time.

• Gordon Cardinal Gray (1910–1993), Archbishop of St Andrews and Edinburgh (1951–1985)
• Sir Francis McWilliams (1926–2022), engineer and former Lord Mayor of London (1992–1993)
• John Mackenzie (1928–2011), film director
• John McCluskey, Baron McCluskey (1929–2017), Solicitor-General for Scotland (1974–1978)
• Richard Demarco (born 1930), arts impresario
• Keith Cardinal O'Brien (1938–2018), Archbishop of St Andrews and Edinburgh (1985–2013)
• Sir Tom Farmer (born 1940), entrepreneur
• Roy Geddes (1940–2006), chemist and biochemist in New Zealand
• Pat Stanton (born 1944), footballer Hibernian F.C., Scotland national football team
• Jimmy O'Rourke (1946–2022), footballer Hibernian F.C.

• Paul Cullen, Lord Pentland (born 1957), Solicitor General for Scotland (1995–1997), Senator of the College of Justice
• Stuart Wood (born 1957), rhythm and bass guitarist and member of the 1970s band the Bay City Rollers.
• Angus MacKay (born 1964), Labour Member of the Scottish Parliament for Edinburgh South (Scottish Parliament constituency) (1999–2003), Minister for Finance and Local Government (2000–2001)
• Alison Johnstone (born 1965), Green Member of the Scottish Parliament for Lothian region (2011–), Presiding Officer of the Scottish Parliament
• Diana Barry (born 1986), former footballer
• Panashe Muzambe (born 1995), professional rugby union player, Scotland women's national rugby union team

• Official School Website

55°55′59″N 3°17′19″W / 55.93306°N 3.28861°W / 55.93306; -3.28861