People in Ajman have been warned against posting or sharing messages that reveal the identities of coronavirus patients or their families.
Those posting defamatory messages on social media or elsewhere could be jailed or hit with fines of up to Dh500,000, Ajman Police said.
The UAE's penal code regards defamation as a criminal offence. Any post that defames someone could lead to criminal charges.
Article 20 of the country’s cyber-crime legislation states that those breaking the law will be punished with imprisonment or a fine between Dh250,000 and Dh500,000.
Meanwhile, Dubai Police issued a warning to people breaking stay-home measures or caught mocking the strategy.
The force said photographs of those who breach stay-home regulations will be circulated publicly and significant fines would be imposed for those breaking travel restrictions.
Col Saeed Al Hajeri, director of Dubai Police's cyber-crime division, said photos of offenders would be shared with local media.
Offenders' images will not be pixelated or blurred.
On Saturday, officials referred 129 people to the Attorney General for failing to abide by quarantine measures.
Those who break the rules will be referred to the Emergency and Crisis Prosecution at the Federal Public Prosecution if the offence is committed for a third time.
People caught flouting the country's stay-home orders face hefty fines and time behind bars.
"They will be tried and jailed for a minimum of three years or fined a minimum of Dh100,000 as per the law," the Emergency and Crisis Prosecution said in a statement carried by state news agency Wam.
"First-time offenders will only be fined Dh50,000 once a report is filed and the offender is informed of his or her offence.
"The fine shall be doubled to Dh100,000 for second-time offenders."
