The grim discovery was made amid escalating drug cartel violence in the Mexican beach city popular with Brit holidaymakers.
Cops found the carnage outside a gymnasium in the Primavera region.
Chilling photos show officers expecting an abandoned car, which reports suggest was parked near the back yard of Cancun's Public Prosecutor's Office.
The vehicle was then towed away for forensic investigation.
No details of how the five were killed or description of the crime scene have been released.
More than 100 people have now been killed in the popular beach resort since the start of 2018.
Drug-related violence in Mexico has increased massively in recent years with murders now commonplace.
Morgues even closed down in the Mexican state of Guerrero after they were deluged with gangland victims.
Cops are trying to protect tourist destinations like Cancun, Playa del Carmen, Cozumel, Los Cabos, Puerto Vallarta, Acapulco and Nuevo Vallarta.
However, in the first three months of 2018 more than 100 people were killed in Cancun alone.
In one 36-hour spell in April 2018 NINE PEOPLE were murdered.
There is currently an increased police presence in the Cancun area, including in the hotel zone.
US authorities have issued a "Level 2" advisory warning travellers to "exercise increased caution", adding "violent crime such as homicide, kidnapping, carjacking, and robbery is widespread".
On April 21, gunmen on water scooters shot at a beach vendor in Cancun's hotel zone, though nobody was hurt.
Travellers are advised to research their destination thoroughly and only travel during daylight hours when possible.
Monitor local media and inform trusted contacts of your travel plans, advises the UK Foreign Office.
When driving, avoid isolated roads and use toll roads (cuotas) whenever possible.
For more advice on travelling to Cancun see our guide to staying safe.
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