Marcu Cercel, also known as Marco Cercel, Marcu-Vodă, or Marco-Voevod ("Marcu the Voivode"; Hungarian: Markó vajda, Italian: Marco Circelli; fl. 1580 – 1620), was a Wallachian adventurer who served as Prince of Moldavia in July–September 1600. His father, Petru Cercel, was Prince of Wallachia in the 1580s, and alleged son of Pătrașcu the Good. This probably meant that Marcu was a nephew of Michael the Brave, who in 1599–1601 managed to control Wallachia, Moldavia, and the Principality of Transylvania, making Marcu his representative or regional co-ruler. It is not precisely known who Marcu's mother was, but she was likely Turkish and related to the Köprülüs; she may be the same as Lady Stanca, who went on to marry Aaron the Tyrant, also Prince of Moldavia.