Baldernock Primary in East Dunbartonshire is holding a celebration party on September 13 to mark the anniversary.
And they have been trying their costumes on for size ahead of the big event.
Head teacher Jill Carr and the school's PTA have extended an invitation to past pupils and their families, including Emmerdale actress Natalie Robb, who was a pupil at the school in the 1980s, to come along and join in.
The fun begins at 5pm when children from Primary 1 to Primary 7, dressed in period costume, will entertain visitors to the school in their classrooms.
After 6pm guests will be welcomed into a marquee in the school's garden, where a buffet and further entertainment will be provided.
Each class has been given a specific era from the 140-year-long history of the school to research.
They will also appear in costumes from their designated era.