| The Mask of Loki | |
| Author: | Roger Zelazny and Thomas T. Thomas |
| Cover Artist: | Gary Ruddell |
| Country: | United States |
| Language: | English |
| Genre: | Science fantasy |
| Publisher: | Baen |
| Release Date: | November 1990 |
| Media Type: | Print (Hardback) |
| Pages: | 340 pp |
| Isbn: | 0-671-72021-X |
The Mask of Loki (1990) is an epic science fantasy novel by American writers Roger Zelazny and Thomas T. Thomas, detailing a centuries long struggle between the avatars of Loki and Ahriman.