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The bar, gallery and auditorium have also been refurbished.
Over the course of the weekend, there were broadcasts of the musical productions, 42nd Street and Cats, public tours of the building and a celebratory evening with some traditional music from Alistair Anderson and band.
Northumberland County Council has contributed £2.5million towards the cost of the work, with the Playhouse raising a further £800,000.
Take a look at these 19 pictures from the grand opening
5. Grand opening
The Duke of Northumberland with Playhouse manager Jo Potts and Chris Sayers, chairman of the Playhouse Trust. | Other 3rd Party Photo: No
6. Bar
The refurbished bar. Pictured are Chris Sayers, chairman of the Playhouse Trust, with the Duke of Northumberland, council leader Peter Jackson and Coun Cath Homer. | Other 3rd Party Photo: No
7. Gallery
Chris Sayers, chairman of the Playhouse Trust, shows The Duke of Northumberland the refurbished gallery. | Other 3rd Party Photo: No
8. Playhouse grand opening
Alnwick Playhouse grand reopening. Councillors Gordon Castle and Cath Homer, chair of the Playhouse Trust Chris Sayers, Playhouse manager Jo Potts, council leader Peter Jackson and Mayor of Alnwick Lynda Wearn. | Other 3rd Party Photo: No