Castle Theatre Wellingborough is located in the town of Wellingborough, Northamptonshire, England.

The Castle was opened in 1995 as a community resource organisation on the site of Wellingborough's Old Cattle Market.

Facilities include: The bar and restaurant facilities are currently operated by Castle Theatre/Parkwood Leisure Spaces are also available for business meetings and functions, wedding receptions, lectures, conferences, Christmas parties, dinners, talks, workshops, classes, and seminars, Programming is a balanced mix of professional work, hires, community theatre, film, live satellite streaming from the National Theatre, Royal Opera House and Royal Shakespeare Company, as well as a professional Christmas show.

In June 2016 Castle Theatre Wellingborough was closed, but was re-opened in August 2016.

The role of artistic director has now ended at the Castle Theatre after Nik Ashton left the theatre in 2011.