Both the editor-in-chief and the editor of the Myanmar Herald Journal -- a publication renowned for its criticism of the government -- were found guilty of defamation at Popathiri court in the capital Naypyidaw yesterday, the paper's deputy editor-in-chief told AFP.
Last year the newspaper ran an interview with an opposition National League for Democracy party member who criticised President Thein Sein as "absurd and insane".
The court said "news journals should not publish (content) like this", deputy editor in-chief Aung Htun Linn told AFP.
He added that editor-in-chief Kyaw Swa Win, who is also the paper's publisher, and editor Ant Kaung Min were sentenced to either a one million kyat (USD 850) fine each or six months in prison.
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They chose to pay the fine after a trial lasting eight months while nine others at the paper were acquitted.
There have been growing concerns over media freedoms won in the former junta-ruled country since Myanmar began emerging from outright military rule in 2011.
"We are getting closer to the election and people need to be informed. It's not good if the government tries to sue us every time they feel disappointed," he said.
"It could tarnish the image of the government and also shows that the media has no freedom," he added.
In February a freelance photojournalist was arrested for uploading a satirical post on Facebook mocking the country's powerful military.
Two soldiers were later acquitted of the murder in a country where the powerful military remains shielded from civilian oversight.