Willem (Dutch pronunciation: [ˈʋɪləm]) is a Dutch and West Frisian masculine given name. The name is Germanic, and can be seen as the Dutch equivalent of the name William in English, Guillaume in French, Guilherme in Portuguese, Guillermo in Spanish and Wilhelm in German. Nicknames that are derived from Willem are Jelle, Pim, Willie, Willy and Wim.

Willem Egbert (Wim) Saris (born 8 July 1943) is a Dutch sociologist and Emeritus Professor of Statistics and Methodology especially known for his work on "Causal modelling in nonexperimental research". and on measurement errors (MTMM analyses, development of the SQP program, and of procedures to correct for measurement errors).

Willem Ooms (13 January 1897 – 24 May 1972) was a Dutch cyclist. He competed in the men's 50km event at the 1920 Summer Olympics.

Willem Swidde (Amsterdam c. 1660 - Stockholm 1697) was a Dutch draughtsman and engraver, active in Sweden.

Willem J. van Asselt (30 April 1946, Slijk-Ewijk – 29 May 2014) was a professor of historical theology and minister in the Dutch Reformed Church. He studied theology at the University of Utrecht, where he received a doctorate in 1988. He chaired the Classic Reformed Theology Workgroup at Utrecht from 1990 until his death. He became docent at Utrecht in 1993. He was appointed professor doctor in historical theology at ETF Leuven in 2008, where he founded The Institute of Post-Reformation Studies.

Jan Willem Snippe (born ( 1986-05-21 ) 21 May 1986) is a Dutch male volleyball player. He is part of the Netherlands men's national volleyball team . He competed at the 2007 Men's European Volleyball Championship . On club level he plays for Saint-Nazaire .

Willem Benson (1521 – 1574), was a Flemish Renaissance painter.

Dirk Willem van Krevelen (8 November 1914, Rotterdam – 27 October 2001, Arnhem ) was a prominent Dutch chemical engineer, coal and polymer scientist. He successfully combined an industrial career, managing a research division at DSM, and an academic career, as Professor of Delft Technical College. His contributions span a wide range of research fields, and his name is linked to the van Krevelen–Hoftyzer diagram for chemical gas absorption, the Mars–van Krevelen mechanism for catalytic oxidation reactions, the van Krevelen–Chermin method to estimate the free energy of organic compounds, the van Krevelen diagram that is used in coal and coal processes, the van Krevelen method to calculate additive properties of polymers, and the van Krevelen–Hoftyzer relationship on the viscosity of polymer fluids.

Willem Claesz Vooght (1572 – 1630), was a mayor of Haarlem best known today for the portrait painted of him by the painter Frans Hals.