Nicolaes Witsen (8 May 1641 - 10 August 1717) was a Dutch diplomat, cartographer, writer and thirteenth mayor of Amsterdam between 1682-1706. He was a representative to the States-General, administrator of the VOC and extraordinary-ambassador extraordinaris to the English court. Witsen was an authority on shipbuilding and his books on the subject are important sources on Dutch shipbuilding in the 17th century.
Nicolaes Witsen was the son of Cornelis Jan Witsen, mayor of Amsterdam, head bailiff and administrator of the Dutch West India Company. Witsen published the first map of Siberia, and in 1692 a treatise titled "Noord en Oost Tartaryen", describing Siberia and the surrounding areas.