- Alexa van der Waall (Simon Fraser)
- Differential Algebra
- 2nd Jan 2003 to 31st Dec 2003
- 1st Oct 2004 to 30th Apr 2005
- 3rd Jun 2009 to 30th Jul 2009
- 1st Nov 2010 to 15th Dec 2010
- Paul van Wamelen (LSU Baton Rouge)
- Arithmetic Geometry
- 1st Jun 2002 to 31st Jul 2003
- Mark Watkins (Bristol)
- Analytic Number Theory
- 15th May 2003 to 15th Aug 2003
- 1st Jul 2004 to 31st May 2005
- 17th Mar 2006 to 19th Apr 2006
- 26th Nov 2006 to 4th Feb 2007
- 11th Feb 2008 to 1st Mar 2008
- Trudy Weibel (ETH Zuerich)
- Logic
- 23rd Apr 1991 to 31st Dec 1991
- Jared Weinstein (Boston University)
- Number Theory
- 20th Apr 2009 to 15th May 2009
- 2nd May 2011 to 13th May 2011
- Volker Weispfenning (Passau)
- Computer Algebra
- 15th Nov 2003 to 24th Nov 2003
- Andrew Wilson (Edinburgh)
- Algebraic Geometry
- 1st Jan 2011 to 31st Mar 2011
- Robert Wilson (QMUL)
- Representation Theory
- 1st Sep 2002 to 14th Oct 2002
- 24th Sep 2005 to 12th Oct 2005
- 27th Apr 2009 to 5th Jun 2009
- Franz Winkler (Linz)
- Computational Algebra
- 3rd Nov 1998 to 26th Nov 1998
- Tom Womack (Nottingham)
- Comp. number theory
- 23rd Jul 2003 to 10th Sep 2003
