In 1967, the Merchant Company announced its plan to combine the two Watson's Colleges to form a single co-educational campus in Colinton Road.
Building work was required to house the combined school.

The first joint assembly of the amalgamated school was held on 1 October 1974.
The school found itself in the Guinness Book of Records as the largest co-educational school in Scotland, with a roll of over 2,400 pupils.

Since then the school has remained co-educational, and now serves day pupils only; previously various boarding houses (nick-named "bug-huts") were maintained from time to time in the Spylaw Road area, and on-campus at New Myreside House.

George Watson's College also incorporates the once entirely separate John Watson's School, the former premises of which now house the Scottish National Gallery of Modern Art.
In 1967, the Merchant Company announced its plan to combine the two Watson's Colleges to form a single co-educational campus in Colinton Road. Building work was required to house the combined school.
The first joint assembly of the amalgamated school was held on 1 October 1974. The school found itself in the Guinness Book of Records as the largest co-educational school in Scotland, with a roll of over 2,400 pupils.
Since then the school has remained co-educational, and now serves day pupils only; previously various boarding houses (nick-named "bug-huts") were maintained from time to time in the Spylaw Road area, and on-campus at New Myreside House.
George Watson's College also incorporates the once entirely separate John Watson's School, the former premises of which now house the Scottish National Gallery of Modern Art.
George Watson's College