Parramatta's NRL and NRLW teams, as well as its elite academy programs, will wear adidas gear from 2027 under a new multi-year partnership.
Fans will see the uniforms for the first time when the teams return in Round 1 that season.
The agreement deepens adidas' presence in the NRL through one of the competition's historic and widely followed clubs.
Parramatta Chief Commercial Officer Dan Clifford said the club's Western Sydney roots were central to its identity.
"Parramatta is more than where we play, it is who we are," Clifford said in a statement.
He said the club's ties to the region had grown across generations of Members, supporters, players and families.
adidas Pacific General Manager Rachel Howard said the partnership reflected the code's importance in Western Sydney.
"Rugby League sits at the centre of life in Western Sydney, and Parramatta is one of the clubs that proves it," Howard said in a statement.
Howard said the deal would support both senior squads and junior players progressing through the club's pathways.
"This partnership is about showing up properly in a code that matters to this country - for both the NRL and NRLW squads, and for the junior players coming through the club's pathways. We're for the long term."