- Barnsley
- Lamproom Theatre Company
- Royston Amateur Performing Arts Group
- Seat of the Pants Theatre Company
- Trinity Players
- Beverley
- Beverley Musical Theatre
- Bradford
- Bradford Catholic Players
- Bradford Youth Players
- Drama Unlimited
- Heaton Amateur Operatic and Dramatic Society
- Re-Invention
- Bridlington
- Bridlington Amateur Operatic and Dramatic Society
- Brighouse
- Brighouse Theatre Productions
- Brough
- The Petuaria Players
- Castleford
- Encore Theatre Company (ETC)
- Kippax Amateur Operatic Society (KAOS)
- Dewsbury
- Dewsbury Arts Group
- Guiseley
- Guiseley Amateur Operatic Society
- Halifax
- Halifax Gilbert and Sullivan Society
- Harrogate
- Deanery Players
- Harrogate Dramatic Society
- Harrogate Gilbert and Sullivan Society
- Harrogate Operatic Players
- Harrogate St. Andrew's Players
- Heckmondwike
- Heckmondwike Players
- Holmfirth
- Honley Players ADS
- Hull
- Bilton Amateur Dramatic Society
- Chameleon Players
- Hull Playgoers' Society
- Hull Savoyards Amateur Operatic Society
- Ilkley
- Upstagers' Theatre Group
- Keyingham
- Keyingham Drama Group
- Knaresborough
- The Knaresborough Players
- Leeds
- Adel Players
- Bramley Parish Theatre Players
- Centre Stage
- The Grove and Rawdon Theatre Company
- LAOS The Musical Theatre Company
- Leeds Art Theatre
- Leeds Children's Theatre
- Leeds Gilbert & Sullivan Society
- The Potato Room Players
- Stampede Theatre Company
- Whitkirk Arts Guild
- Yeadon Amateur Operatic & Dramatic Society
- Northallerton
- Allerton Players
- Pickering
- Pickering Musical Society
- Pocklington
- Pocklington Dramatic Society
- Pontefract
- Carleton Theatre Group
- St. Giles Pantomime Society
- Redcar
- Redcar Operatic Society
- Richmond
- Richmond Operatic Society
- Ripon
- Ripon Rowel Players
- Rotherham
- Far Out Theatre
- Rotherham Rep
- Rotherham Teachers Operatic Society & Student Academy
- Star Productions
- Third Nail Theatre
- Settle
- Settle Amateur Operatic Society
- Sheffield
- Apex Players
- Chapeltown Amateur Operatic Society
- Croft House Operatic Society
- Denys Edwards Players
- Ecclesall Theatre Company
- Ellesmere Operatic Society
- Manor Operatic Society
- The Merlin Players
- Open Door Theatre Company
- Sheffield Teachers' Operatic Society
- Southey Musical Theatre Company
- Skipton
- Little Saods Youth Theatre Group
- Skipton Players
- Tadcaster
- Tadcaster and District Amateur Operatic Society
- Wakefield
- Saint Austin's Players
- Wakefield Little Theatre
- Wetherby
- Wetherby Musical Theatre Group
- York
- Oakline Players
- York Light Opera Company
- York Musical Theatre Company
- York Opera
- York Stage Musicals
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