Dimitrios Markos (Greek: Δημητριος Μαρκος; born 13 September 2001) is a Greek swimmer.

[1] He is the current National Record holder in the 400m freestyle with a time of 03:47.77 and in the 800m freestyle with a time of 07:48.59.

[2] He is part of club team ANO Argyroupolis and is coached by Alexandros Moraris.

He competed in the men's 200 metre freestyle at the 2020 Summer Olympics.

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