IMPA may refer to:

• Impa, a recurring character in The Legend of Zelda series

• Impa Kasanganay (born 1994), American mixed martial artist

• Industrias Metalúrgicas y Plasticas Argentinas S.A., an Argentine aircraft manufacturer which made the IMPA Tu-Sa, a civil aviation trainer aircraft

• International Marine Purchasing Association, a marine supply-chain organization; see IMPA coding

• Interplanetary Monitoring Platform-A (IMP-A or IMP 1), a research satellite launched in 1963 as part of the Explorer program

• International Motor Press Association, a trade association representing automotive journalists and public relations professionals in the United States

• Instituto Nacional de Matemática Pura e Aplicada, Brazil's National Institute for Pure and Applied Mathematics

• EET Nº7 Taller Regional Quilmes (IMPA), a high school in Quilmes, Buenos Aires

• isopropyl methylphosphonic acid, a metabolite of sarin

• International Mission Photography Archive (IMPA), a repository in the USC Digital Archive offering historical photographs from the archives of international missionary organizations.

• IMPA1 (Inositol(myo)-1(or 4)-monophosphatase 1), a human gene

• Impa shilup, or "Nalusa chito", the soul eater, one of the Choctaw mythology Shadow-like beings