California State Summer School for Mathematics and Science (COSMOS)
   An academic four-week residential program for talented and motivated students who are completing grades 8-12.
   http://www.ucop.edu/cosmos/

Canada / USA Mathcamp
   A summer camp for mathematically talented and mathematically gifted high school students from around the world. It includes advanced mathematical topics not normally covered in high schools.
   http://www.mathcamp.org/

HCSSiM
   Hampshire College Summer Studies in Mathematics for mathematically talented high school students. 2004 session: 4 July -- 14 August.
   http://www.hcssim.org/

Heriot-Watt/Edinburgh Maths Masterclass
   Masterclasses for the brightest mathematics school students in Lothian Region. The pupils, aged about 13, spend 2 1/2 hrs each Saturday studying recent developments in Mathematics.
   http://www.ma.hw.ac.uk/maths/Teaching/masterclass/

MathCamp
   A classroom-focused mathematics resource for teachers on the elementary, middle and high school levels.
   http://www.mathcamp.com/

Mathematics Advanced Study Semester (MASS)
   A comprehensive, semester-long mathematical environment for a group of talented undergraduate students recruited from throughout the United States, held at Penn State.
   http://www.math.psu.edu/mass/

Mathematics Enrichment Programme
   Centre for Teaching Mathematics, University of Plymouth. Extra-curricular activities for young people from primary through to VIth form who are able or interested in mathematics and its applications. The activities are centred around the Plymouth area.
   http://www.tech.plym.ac.uk/maths/CTMHOME/mep.htm

Maths Inspiration
   Events aimed at motivating UK pupils at year 11 and above to pursue mathematics and other critical thinking subjects to a higher level at school and beyond.
   http://www.mathsinspiration.co.uk/

Mathworks
   Texas State University - San Marcos: teacher programs, summer camps and mentoring.
   http://mathworks.txstate.edu/

Michigan Math and Science Scholars
   Annual summer program at the University of Michigan in Ann Arbor. Information, course details, fees, and registration.
   http://www.math.lsa.umich.edu/mmss/

PROMYS
   The Program in Mathematics for Young Scientists: a six-week summer program at Boston University.
   http://www.promys.org/

Royal Institution Mathematics Masterclasses
   The Royal Institution holds Mathematics Masterclasses in the Autumn and Spring terms of each year. Dates and links to local organisers.
   http://www.rigb.org/events/programmeformaths.html

Royal Institution Mathematics Masterclasses - Staffordshire
   Organised by Keele University.
   http://www.keele.ac.uk/depts/ma/masterclass/

SIMUW
   Summer Institute for Mathematics at the University of Washington. SIMUW 2005: 26 June -- 6 August 2005.
   http://www.math.washington.edu/~simuw/

Stanford University Mathematics Camp (SUMaC)
   Brings mathematically talented and motivated high-school students from around the world to Stanford University for four weeks of serious mathematical pursuits. 2004 session: 18 July -- 14 August.
   http://math.stanford.edu/sumac/

Summer Program for Women in Mathematics
   A five-week intensive program for mathematically talented undergraduate women who are completing their junior year and may be contemplating graduate study in the mathematical sciences. George Washington University, DC, USA.
   http://www.gwu.edu/~math/spwm.html

Summer Programs for High School Students
   A list of programs which help high school students explore the world of mathematics research, compiled by the AMS.
   http://www.ams.org/employment/mathcamps.html

SummerMath
   A four-week program for young women entering ninth through twelfth grades. Mount Holyoke College, MA, USA. 2004 session: 27 June -- 24 July.
   http://www.mtholyoke.edu/proj/summermath/

TeachMap Workshops
   COMAP workshops that focus on using open-ended, authentic applications to teach a variety of mathematics topics.
   http://www.comap.com/undergraduate/projects/teachmap/

The Ross Program
   An intensive course in mathematics at the Ohio State University for pre-college students.
   http://www.math.ohio-state.edu/ross/

Young Scholars Program in Discrete Mathematics
   Annual four-week academic program introducing talented and highly motivated high school students to discrete mathematics. DIMACS, Rutgers, New Jersey, USA. 2004 session: 5--30 July.
   http://dimacs.rutgers.edu/ysp/