Isabella, or the Pot of Basil (1818) is a narrative poem by John Keats adapted from a story in Boccaccio's Decameron (IV, 5). It tells the tale of a young woman whose family intend to marry her to "some high noble and his olive trees", but who falls for Lorenzo, one of her brothers' employees. When the brothers learn of this they murder Lorenzo and bury his body. His ghost informs Isabella in a dream. She exhumes the body and buries the head in a pot of basil which she tends obsessively, while pining away.
The poem was a precursor to The Eve of Saint Agnes. Both are set in the middle ages and concern passionate and dangerous romances. It was published in 1820 along with the latter work and others.