Half Bad is a 2014 young adult fantasy novel written by English author Sally Green that won the 2015 Waterstones Teen Book Prize and was shortlisted for the 2015 Branford Boase Award.

[7] A Publishers Weekly starred review states, "This grim and thrilling tale, first in a planned trilogy, features understated prose that lets readers' imaginations fill in the blanks, as well as a well-developed sense of Witch culture.

Nathan, the damaged survivor of horrific abuse, is an unforgettable protagonist, and Green expertly captures his torment at being caught between the mutually hostile sides of his heritage.

"[9] In a review for Tor.com, Kat Kennedy writes, "Sally Green's Half Bad is the perfect novel for inspiring one to despise all of humanity or fall onto the ground and weep pathetically.

"[10] In a review for The Guardian, Philip Womack writes, "While there is nothing new here, Half Bad's combination of themes will no doubt be entirely attractive to a large section of readers.

"[11] In a review for The Telegraph, Martin Chilton writes, "Half Bad doesn't always feel particularly original (scenes are set in mysterious alleys) but it is full of suspense.