The Sikh temple is the largest in Scotland – and is thought to be one of the largest faith buildings of any kind in the country.
There are 20,000 Sikhs in Scotland, most of them in the Glasgow area.
Among those attending the official opening is First Minister Nicola Sturgeon.
Almost all the materials used were imported from India and the project cost about £8m. The building includes classrooms, a library, office and a pool.