Wildlife activists found two tigers and a black panther frozen at a house in the central province of Nghe An, local news website Vnexpress said Tuesday.
The UK-based wildlife trade monitoring network TRAFFIC said the three bodies and five kilograms of what are suspected to be tiger bones were found at a 53-year-old man's house last week.
Environmental police and concerned agencies assisted in the findings, the network said.
Though protected by Vietnamese and international law, tigers and panthers in Vietnam and Southeast Asia are continually hunted for food, medicine and souvenirs.
In March, border guards in the central province of Quang Tri found the carcasses of a 95 kilgram tiger and a 27 kilogram panther that had been trafficked into Vietnam to be sold.
In October last year, environmental police also confiscated two frozen tigers weighing in at 130 kilos in total and arrested five traffickers from Hanoi.
Conservationists estimated that there are only around 30 wild tigers left in Vietnam and 3,200 in the world.
Starting from this Year of the Tiger, TRAFFIC and the World Wildlife Fund are together calling for more political commitment from countries to double the tiger population by 2022, the next Year of the Tiger according to the Chinese lunar calendar.