Broadcaster NET has come under fire from the country's main opposition party after it removed a scene from the premiere episode of the period drama, The Guardian reports.
Greek viewers also took to Twitter to condemn the decision to remove the kiss between a visiting duke and footman Thomas.
"As incredible as it may seem for a democratic country in the 21st century, officials of the NET television channel censored the scene of a kiss between men from the TV drama Downton Abbey," the Syriza party said in a statement.
"This is of course an obvious case of censorship, an extreme act of homophobia and discrimination which unfortunately, after what has been happening recently, we cannot characterise as unprecedented."
NET denied that it censored the kiss, insisting it removed the scene to comply with time slot rules relating to the parental consent label given to the show, which aired at 10.05pm on Monday. An unedited version will be broadcast later on Tuesday night, the network said.
"The love affair between the two men... was not censored," said Costas Spyropoulos, managing director of the Hellenic Broadcasting Corporation. "The kiss was not shown because of the time the programme was broadcast and the corresponding parental guidance warnings."