| Office: | Leader of the Opposition |
| Term Start: | 3 July 2023 |
| Predecessor: | Alexis Tsipras |
| Primeminister: | Kyriakos Mitsotakis |
| Office1: | Parliamentary leader of Syriza |
| Termstart1: | 3 July 2023 |
| 1Blankname1: | Party President |
| 1Namedata1: | Alexis Tsipras Stefanos Kasselakis |
| Predecessor1: | Alexis Tsipras |
| Birth Date: | 27 March 1966 |
| Birth Place: | Athens, Greece |
| Birth Name: | Sokratis Famellos |
| Children: | 1 |
| Office2: | Alternate Minister for Environment and Energy |
| Primeminister2: | Alexis Tsipras |
| Minister2: | Giorgos Stathakis |
| Termstart2: | 5 November 2016 |
| Termend2: | 9 July 2019 |
| Office3: | Member of the Hellenic Parliament |
| Party: | Syriza |
| Termstart3: | 25 January 2015 |
| Constituency3: | Thessaloniki B |
| Alma Mater: | Aristotle University of Thessaloniki Hellenic Open University |
| Predecessor2: | Giannis Tsironis |
| Successor2: | Giorgos Amyras |
Sokratis Famellos (Greek, Modern (1453-);: Σωκράτης Φάμελλος; born 27 March 1966) is a Greek politician and former chemical engineer who has served as Leader of the Opposition and President of Syriza in the Hellenic Parliament since 2023.
Sokratis Famellos was born on 27 March 1966 in Athens, but was raised in Thessaloniki.[1] He earned a diploma from the Aristotle University of Thessaloniki, and a Master of Science in Environmental Planning and Management from the Hellenic Open University; later working as a chemical engineer.[2]
Famellos was elected to the Hellenic Parliament representing for Thessaloniki B in 2015. He was reelected for the constituency in 2019 and served as the Alternative Minister for the Environment and Energy from November 2016 to July 2016.
Following the defeat of Syriza in the June 2023 Greek legislative election and the resignation of Alexis Tsipras as party chairman, on 3 July 2023 Famellos was elected as chairman of the Syriza parliamentary group.[3]
Prior to the 2023 Syriza leadership election, there was speculation that Famellos would be a candidate, which he denied.[4] Under the new leader, Stefanos Kasselakis, Famellos retained his position as chairman of the parliamentary group.[5] [6] Even though Syriza itself[7] as well as the Greek media[8] [9] refer to Kasselakis as Leader of the Opposition, de jure this is not the case: the only legal definition of the position, in the statute of the Hellenic Parliament, reserves the position for the leader of the largest parliamentary group not participating in the government, who by law must also be an MP. As Kasselakis is not an MP, this position belongs to Famellos.[10]
Famellos was married to Popi Karagiannidou until her death in 2018.[11] They had one son together.