The nearly 21-foot crocodile weighs more than a ton and is suspected of killing two people.
Lolong was captured in 2011, in the Philippines.
The Guinness Book of World Records declared that the mighty beast is the largest reptile in captivity, according to Agence France Presse.
It's suspected of killing a girl and also thought to be connected to the disappearance of a fisherman, said AFP.
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News of the world record sparked celebrations in Bunawan, the farming town where the crocodile was captured, according to the Associated Press. However, Mayor Edwin Cox Elorde said the townspeople are also concerned there might be more giant crocodiles lurking in the marshlands.
"We’re really proud because it proves the rich biodiversity of our place but at the same time, there are fears that Lolong may not be alone," he told the AP.
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"The largest crocodile in captivity is Lolong, a saltwater crocodile (Crocodylus porosus), who measured 6.17 m," said Guinness on its website.
The (possible) killer has brought in $72,000 in revenue for the town from entrance fees for the park in which it lives.
AFP noted that Lolong's diet includes eight to ten kilograms (17 to 22 pounds) of beef, pork and poultry every week.
Here's a video from when Lolong was captured last September: