Leeds United, Hull City and Sheffield Wednesday's Championship rivals move swiftly to appoint new head coach
The R’s sit 23rd in the second tier, having endured a torrid start to the season under Gareth Ainsworth.
Cifuentes has arrived from Swedish side Hammarby, having previously led the likes of Aalborg BK and Sandefjord.
QPR’s CEO Lee Hoos said: “We are delighted to bring Martí in and I would firstly like to thank Hammarby for being fantastic to deal with throughout the process.
“Martí is an exciting appointment and we look forward to seeing the impact he can have.
"Having a succession plan in place is a necessary part of football, irrespective of how the team are performing.
"Martí is someone we have been aware of so we are really pleased to have been able to secure his services.”