Horizon is a 2009 fantasy novel by American writer Lois McMaster Bujold.

A powerful groundsetter at local New Moon Cutoff Camp could be the answer to his prayers, but conflicts arise between the insular Lakewalker traditions and Dag's determination to be a healer for farmers.

They are joined by several other characters, some Lakewalker, some farmer, including Fawn's brother, Whit, and his wife, Berry.

On their way up the Trace, a long wagon road, they encounter a malice, an evil being with great power.

At the end of the book, Dag and Fawn's vision of closer cooperation and understanding between Lakewalkers and farmers, as partners, is beginning to be achieved.