"Ola Kala" (Greek: "Όλα Καλά"; English: Everything is fine) is the second single released by Greek singer Sakis Rouvas from his eighth studio album of the same name in September 2002. The single was also released initially in France and in many other parts of Europe by 2004. It served as his second internationally released single. While it topped the Greek Airplay charts, it did not chart on the French charts. It was released in both Greek and English versions. The song received generally favourable reviews from Greek music critics.

The music video of the song was directed by French director Xavier Gens in Montreal, Quebec, Canada and features the "Stereodrome Remix" of the song. Its cinematography features slow motion and back travel scenes. Rouvas has performed the song at the first Arion Music Awards and on all of his subsequent tours.

"Ola Kala" was written by American songwriter and record producer Desmond Child, who also produced Rouvas' entire album of the same name, and by Greek songwriter Phoebus. The song is produced by Child. The Greek lyrics are by Phoebus while its English counterpart is by Swedish songwriter Andreas Carlsson. In Greece the song was released as a maxi single containing the English versions Ola Kala's three singles, which were also available on the reissue of the album after its release in the foreign market that summer; thus it was meant for listeners who had already purchased the original edition of the album without the English versions in April 2002. The international release of the single featured only that track, in its Greek and English versions as well as remixes. The remixes of "Ola Kala" were also featured on Rouvas' remix album the following year.

Critical reaction from Greek critics was mostly positive. An unidentified Music Corner reviewer suggested that many would be curious as to how Rouvas sings in English, adding that "we must admit that [Rouvas] has the capabilities of [establishing a career abroad]." He further noted of the maxi single "[n]ot bad...! Not bad...!", indicating his belief that it had potential to be successful abroad. In a flashback review of the artists work, Thomai Karathanou of Tralala reviewed the song positively for its positive message, saying "he [gave] us courage."

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