The rhino, aged around 15, was killed by the poachers for its skin.
The killing took place between Dumariya and Jarneli forests of the park, according to Narendraman Babu Pradhan, the park´s chief conservation officer.
The park´s patrol team found the dead body of the rhino on Thursday night.
Twenty-four rhinos of the park have been killed by poachers since the last rhino census in 2008.
Related story
Rhino population in Nepal reaches 752
