He returned to Woking as engineering director last September.
"His arrival is yet another step as we build and improve our team structure," said Renault's executive director Marcin Budkowski, who worked previously with Fry at McLaren.
"Pat’s experience, talent and determination will be additional assets as we continue our progress."
Renault announced on Friday that Dirk De Beer was returning to the team as head of aerodynamics with a deputy to join next year from another team.
Renault, with Australian driver Daniel Ricciardo and German Nico Hulkenberg, are fifth in the constructors' championship with three races to go, after finishing fourth last year. (Reporting by Alan Baldwin in London, editing by Clare Fallon)