The winning concept saw off competition from Bauman Lyons Architects, Feilden Clegg Bradley, OMI Architects, Richard Murphy Architects and Terry Pawson Architects.
McLaughlin will now create plans for the town's 'flagship building', which will house a library, museum and gallery. This forum will be a 'key project' within the £50 million regeneration of the town centre.
McLaughlin said he was very pleased with the win. 'We are delighted to have been chosen from an exceptionally strong shortlist of architects. Castleford is a really exciting town to be working in at the moment,' he said.
'[The council] has chosen to lead its urban renewal using a new generation of British architectural talent.
'The forum is a wonderful programme with strong roots in the local community,' he added. 'This is quite a treat for us.'