- Kentaro Kamoda (Kyushu)
- Number Theory
- 18th Feb 2016 to 5th Mar 2016
- Alexander Kasprzyk (Imperial)
- Algebraic Geometry
- 28th Jan 2009 to 7th Mar 2009
- 4th Jan 2012 to 7th Feb 2012
- Kiran Kedlaya (MIT)
- Arithmetic Geometry
- 20th Dec 2011 to 21st Dec 2011
- Jakob Kellner (Vienna)
- Logic
- 1st Jul 1997 to 31st Dec 1997
- Gregor Kemper (TU Munich)
- Commutative Algebra
- 15th Jul 1996 to 31st Aug 1996
- 21st Jun 1998 to 11th Jul 1998
- 20th Nov 1999 to 5th Dec 1999
- 11th Sep 2006 to 29th Sep 2006
- Doris Kern (TU, Berlin)
- Comp. number theory
- 21st Oct 2009 to 31st Oct 2009
- Kamal Khuri-Makdisi (American University, Beirut)
- Number Theory
- 15th Aug 2009 to 15th Sep 2009
- Markus Kirschmer (RWTH Aachen)
- Group Theory, Lattices
- 20th Sep 2007 to 3rd Nov 2007
- 3rd Oct 2009 to 1st May 2010
- 15th Sep 2012 to 31st Oct 2012
- 5th Sep 2016 to 28th Sep 2016
- Jürgen Klüners (Kassel)
- Number Theory
- 27th Feb 1999 to 8th Apr 1999
- 29th Aug 2001 to 12th Oct 2001
- 2nd Feb 2006 to 22nd Mar 2006
- Axel Kohnert (Bayreuth)
- Combinatorics
- 12th Aug 2001 to 2nd Apr 2002
- 21st Jan 2008
- Mitsuhiro Kondo (Kyushu)
- Computational mathematics
- 18th Feb 2016 to 5th Mar 2016
- Momonari Kudo (Kyushu)
- Number Theory
- 15th Feb 2016 to 2nd Mar 2016
