Math Enrichment Programs
Residential Summer Programs
RSI (Extremely Prestigious Guided Research Program hosted at MIT)
Stanford Math Camp (SUMaC) (Research Program with online or residential options)
Canada/USA Mathcamp (Introduces Advanced Math Concepts)
PROMYS (Number Theory oriented)
ROSS Mathematics Program (Number Theory oriented)
MathILy (Discrete Math oriented)
MathILY-er (like MathILy but for younger students)
MathPath (must be age 11-14 during the summer camp)
Summer Workshop in Mathematics (SWIM) (for female students only)
G2 (Girls Together) Math Program (for female students only)
Summer Program on Applied Rationality and Cognition (SPARC) (math, logic, game theory, and philosophy)
The Atlas Fellowship (Not necessarily for Mathematics)
Online Programs
MIT Primes (Prestigious Guided Research Program)
Stanford Pre-Collegiate University-Level Online Math & Physics Courses (post-AP Calculus Math Courses)
Classes from The Art of Problem Solving (math, physics, chemistry, and computer science)
AwesomeMath (Problem Solving Oriented courses - summer and year-long programs)
Olympiad Training for Individual Students (OTIS) (Math Olympiad training)
Athemath Program (specifically for girls)
Lumiere Research Programs (Research Mentorship - not necessarily for Mathematics)