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A semi-postal stamp or semipostal stamp is a philatelic term for a postage stamp issued to raising money for some purpose, usually for charity. Semi-postals have an additional monetary value (surcharge), devoted to that specific non-postal, charitable purpose and separated from the official postal value with a "+" sign.
- Cabeen, Richard McP. Standard Handbook of Stamp Collecting. New York: Thomas Y. Crowell. pp. 455–457. . https://books.google.com/books?hl=en&id=vB4YAAAAIAAJ&q=Semi-postal#search_anchor.
- "Semipostal". Glossary of Stamp Collecting Terms. AskPhil; Collectors Club of Chicago. http://www.askphil.org/b25s.htm. Retrieved 2009-08-22.
- "GAO Report No. GAO-05-953 'U.S. Postal Service: Factors Affecting Fund-Raising Stamp Sales Suggest Lessons Learned'". Reports & Testimonies (updated daily). U.S. Government Accountability Office (U.S. GAO). 2005-09-30. http://www.gao.gov/atext/d05953.txt. Retrieved 2009-08-22.