The Castle of Llyr
| Imprint | Lions |
| Publisher | William Collins Sons & Co Ltd. |
| Copyright Holder | Lloyd Alexander |
| First Published by | Dell Publishing Co., Inc. |
| Cover Art by | Brian Froud |
| Printed and Bound by | William Collins Sons & Co Ltd. |
| Series | Chronicles of Prydain |
| Format | Paperback |
| Language | English |
| Location | UK |
| Copyright | 1966 |
| This Edition Published | 1977 |
| This Impression | 1979-06 |
| Pages / Font | 160 pages |
| ISBN | 0 00 671128 6 |
| Price | UK 65p / Australia $1.95 / New Zealand $1.95 / Rep. of Ireland 71½p |
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