Mandy Hager has been awarded the Katherine Mansfield Menton fellowship for 2014, and she was the 2012 recipient of the New Zealand Society of Authors Beatson Fellowship.

She won the Esther Glen Award for Fiction for her YA novel Smashed and Best Young Adult Book in the NZ Post Book Awards 2010 for The Crossing. The Nature of Ash won the LIANZA YA Fiction Award in 2013 and was shortlisted for the 2013 NZ Post Children's Book Awards. In 2015 her novel Singing Home the Whale was awarded a Storylines Notable Book Award; was a finalist for the LIANZA YA Fiction award; it won the YA category of the New Zealand Book Awards for Children and Young Adults; and was named the 2015 Margaret Mahy Book of the Year.

Singing Home the Whale was described by the judges as a novel that "should be compulsory reading in any country that still hunts whales."Hager has a MA in Creative Writing from Victoria University and an Advanced Diploma in Applied Arts (Writing) from Whitireia Community Polytechnic, where she now works as a tutor and mentor. She lives with her partner on the Kapiti Coast. She has written novels for adults and young adults, short stories, scripts, and non-fiction resources for young people.