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Explore -- Discover another region of Canada while learning French.
http://www.myexplore.ca/en/

ShadValley -- a four week summer enrichment program.
http://www.shad.ca/

Peel Summer Academy(PSA), established in 1984, consists of 4 unique summer residential programs for intellectually gifted students - grades 4 to 10.
http://www.peelsummeracademy.com/

York Lions in Training (Y-LIT) Program. A High School Mentorship Program.
http://www.yorku.ca/ylit

High School Enrichment, the Waterloo Way:
http://www.unlimited.uwaterloo.ca/
http://findoutmore.uwaterloo.ca/programs/enrichment.php

Queen's Enrichment Studies Unit:
http://esu.queensu.ca/

Discover Teenergy.
http://www.discoverteenergy.com/

Resources for high school students.
http://www.youthcanada.ca/

AMERICAN

The Summer Institute for the Gifted (USA) offers residential and day programs for gifted and talented students in grades K through 11.
http://www.giftedstudy.org/

AIFS University Prep (an intensive 3-week summer program focused on assisting university-bound students to increase their SAT scores). http://www.giftedstudy.org/aifs.asp

American Mathematical Society. Summer programs that help gifted students explore the world of mathematics research (most are residential programs accepting applications nationwide).
http://www.ams.org/programs/students/high-school/emp-mathcamps

Global Young Leaders Conference (GYLC). Sponsored by the Congressional Youth Leadership Council, the Global Young Leaders Conference (GYLC) offers students from countries all over the world the unique opportunity to interact with each other and explore global leadership issues.
http://www.cylc.org/gylc/

BRITISH

St. Hugh's College Summer Program. St. Hugh's College, University of Oxford, England:
More at: http://www.sthughs-summerschool.info/