The country National Public Health Institute says a 43- year- old man in the county of Maryland was is the first confirmed case so far.
Earlier on Sunday, the World Health Organization declared monkeypox outbreak as a global health emergency.
The classification is the highest alert that the WHO can issue and follows a worldwide upsurge in cases.
It came at the end of the second meeting of the WHO’s emergency committee on the virus.
More than 16,000 cases have now been reported from 75 countries, said WHO director general Dr Tedros Adhanom Ghebreyesus.
There had been five deaths so far as a result of the outbreak, he There are only two other such health emergencies at present – the coronavirus pandemic and the continuing effort to eradicate polio.
Liberia is already fighting the global Covid-19 pandemic that has killed more than 200 people.
The Ministry of health is warning the public to take precautions against the virus.
About Monkeypox
Monkeypox is a rare disease caused by infection with the monkeypox virus. Monkeypox virus is part of the same family of viruses as variola virus, the virus that causes smallpox. Monkeypox symptoms are similar to smallpox symptoms, but milder, and monkeypox is rarely fatal. Monkeypox is not related to chickenpox.
Monkeypox was discovered in 1958 when two outbreaks of a pox-like disease occurred in colonies of monkeys kept for research.