Troll Mill

infobox Book |
name = Troll Mill
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author = Katherine Langrish
illustrator =
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country = England
language = English
series = Troll Trilogy
genre = Children's, Fantasy novel
publisher = HarperCollins
release_date = July 4, 2005
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media_type = Print (Hardback & Paperback):| pages =
isbn = ISBN 0007170718 (first edition, hardback)
preceded_by = Troll Fell
followed_by = Troll Blood

"Troll Mill" is a children's fantasy novel written by Katherine Langrish, the second in the Troll Trilogy. It follows the events of "Troll Fell". The hero Peer Ulffson now lives with his friend Hilde and her family. One day, returning from a fishing trip in stormy weather, he is horrified when a neighbour's wife pushes her newborn child into his arms before throwing herself into the sea. As he carries the child home through the windy night, he sees the old deserted mill mysteriously working away 'all by itself'. In the ensuing adventures Peer struggles to make sense of these strange events, and to prove himself to Hilde and the world.

As in the first book of the trilogy, "Troll Fell", Langrish uses a variety of folklore motifs such as the Orkney legends of seal people or "selkies" to create an unusual and believable fantasy.