| Cover of the first edition | |
| Author | John Brunner |
|---|---|
| Cover artist | Ed Emshwiller |
| Language | English |
| Series | Zarathustra Refugee Planets |
| Genre | Science fiction |
| Publisher | Ace Books |
Publication date | 1962 |
| Publication place | United States |
| Media type | Print (paperback) |
| Pages | 127 pp |
| Followed by | Castaways' World |
Secret Agent of Terra is a 1962 science fiction novel by British writer John Brunner. It is the first book of the Zarathustra Refugee Planets series; the other books are Castaways' World (1963) and The Repairmen of Cyclops (1965). Secret Agent of Terra was first published as Ace Double F-133, with The Rim of Space by A. Bertram Chandler.
Brunner later reworked the story for his 1969 novel The Avengers of Carrig.