- Bradley University Problem of the Week - Weekly math problem and archive from Professor Alberto L. Delgado.
- Columbus State University - Problem of the Week Contest - A weekly contest for all students from elementary to high school. Prizes awarded each month.
- Dansmath Problem of the Week - Weekly math problem, with solutions, archive, and leader board.
- IBM Research Ponder This - A monthly on-line competition hosted by researchers at IBM.
- John Handley High School Problem of the Week - Weekly math problem with solutions and archive.
- Ken Duisenberg's Puzzle of the Week - Problem archive and puzzle links.
- Macalester College Problem of the Week - Weekly math problem and archive from Professor Stan Wagon for first-year college students presented by the Math Forum.
- Math Forum: Algebra Problem of the Week - Past archive and solutions. Receive help from a mentor. Paid membership required to view problems.
- Math Forum: Discrete Math Problems of the Week - Past problems and solutions, student recognition. Paid membership required to view problems.
- Math Forum: Geometry Problem of the Week - Past archive and solutions. Receive help from mentor. Paid membership required to view problems.
- Math Forum: Math Fundamentals Problem of the Week - A weekly interactive project for elementary school mathematics. Past problems, solutions, and student recognition. Paid membership required to view problems.
- Math Forum: Problems of the Week - Projects from the Math Forum presenting weekly interactive math challenges to accumulate points for bronze, silver and gold prizes. Individual or class participation. Paid membership required to view problems.
- Math Magic - Devoted to original mathematical recreations with puzzles and links.
- Mathematics Problem Solving Task Centres - Designed to assist teachers and students in problem solving. Includes problem of the month. Paid membership is required to view archived problems.
- Monthly Problem - Math problems and solutions from Math Central.
- Problem of the Fortnight - Twice-monthly problems with archive and solutions.
- Problem of the Month - Posted by the Mathematics Department of Bilkent University.
- Purdue University Problem of the Week - Weekly math challenge with past problem archives and solutions.
- PuzzleUp - Weekly math problem with archive and scoreboard.
- Stony Brook Problem of the Month - Monthly math challenge with past problem archives and solutions, and hall of fame.
- Trent University Problem of the Week - Weekly math problems and solutions from Trent University.
