jhr Diederik Ludolf Six (M.Sc.) is a Dutch restoration architect and photographer. He studied architecture at the Technical University Delft and has been managing bureau Six Architects since 1991. He worked on the restauration of, for example, the Sao Jorge da Mina of Elmina fort in Ghana and fort Amsterdam on St. Maarten.
Diederik Six is president of ICOMOS-Netherlands. For ICOMOS he designed the Water & Heritage Awareness Shield to honour projects that link water management and cultures and can be attached on restored hydraulic engineering related monuments.