The Curtiss-Wright Model 21 (also known as the Curtiss-Wright Model 21 Demonstrator, the Curtiss-Wright CW-21 Interceptor, the Curtiss-Wright CW-21 Demon) was a United States-built fighter interceptor, developed by the St. Louis Airplane Division of Curtiss-Wright Corporation during the 1930s.
Curtiss-Wright Model 21 (còn gọi là Curtiss-Wright Model 21 Demonstrator, Curtiss-Wright CW-21 Interceptor, Curtiss-Wright CW-21 Demon) là một loại máy bay tiêm kích đánh chặn của Hoa Kỳ, nó được phát triển bởi phân nhánh St. Louis Airplane của hãng Curtiss-Wright Corporation vào thập niên 1930.