**4. Conclusions**

In the present study we demonstrated that fatty acid compositional data and sterols have a high differentiation potential as authenticity tools. Meanwhile, analyses on other more or less exploited Greek monocultivars need to be performed in order to reveal and evaluate their quality and chemical characteristics so as to establish a national authenticity databank. Finally, the possibility of investigating other components present in olive oils and taking into account new authenticity methodologies would be useful for the comparison of different Greek monocultivars in the region.

**Author Contributions:** V.S. designed and performed the experiments; P.T. performed statistical analysis; T.V. and V.S. wrote, edited, and reviewed the paper. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research project was funded under the Project "Research and Technology Development Innovation Projects"-AgroETAK, MIS 453350, in the framework of the Operational Program "Human Resources Development." It is co-funded by the European Social Fund through the National Strategic Reference Framework (Research Funding Program 2007–2013) coordinated by the Hellenic Agricultural Organization–DEMETER.

**Acknowledgments:** V.S. would like to thank A.S. Vekiari and the Dept. of Olive and Horticultural crops, Kalamata, Greece, for the support provided. All the experiments were conducted in the accredited laboratory of the Dept. of Olive and Horticultural crops, Kalamata, Greece, according to ISO 17025:2008.

**Conflicts of Interest:** The authors declare no conflict of interest.
