It said the dead were members of its armed forces and intelligence agencies, with two days of national mourning declared.BBC reported.
A short statement did not elaborate on the role of the Cubans in Venezuela, but the two governments are long-standing allies, with Cuba providing security support in exchange for oil.
Cuban President Miguel Diaz-Canel said they had been providing protection to Maduro and his wife "at the request" of Venezuela.
An official government statement read: "Our compatriots fulfilled their duty with dignity and heroism and fell, after fierce resistance, in direct combat against the attackers or as a result of bombings on the facilities."
Venezuela has not confirmed how many people were killed during the US raid on Maduro's compound in Caracas on Saturday.
The New York Times, citing an unnamed Venezuelan official, reported on Sunday that the death toll stood at 80 and was expected to rise. BBC News has not independently verified that report.
In the days following the capture of Maduro, questions have been raised over whether the Trump administration could consider a similar operation against Cuba, which, like Venezuela, has had decades of adversarial relations with the US.
Speaking to reporters on Sunday, US President Donald Trump said military action would not be necessary because "Cuba is ready to fall".
He continued: "I don't think we need any action. Looks like it's going down. It's going down for the count."
