Olympia "Lia" Vissi is a Greek-Cypriot singer, and also elder sister of Anna Vissi, and is also the lesser famous of the two sisters.

She took part in the Cypriot national final quite a number of times, and represented Greece as a backing singer in 1979, which makes it that both Vissi sisters represented Greece and Cyprus at some point.

Like the United Kingdom's Ronnie Carroll, she went on to politics in Cyprus, but she was not elected for the Larnaca District.