Tully is a 2018 American black comedy film directed by Jason Reitman, written by Diablo Cody, and starring Charlize Theron, Mackenzie Davis, Ron Livingston, and Mark Duplass. The film follows the developing friendship between a mother of three and her night nanny. It is the fourth collaboration between Reitman and Cody, following Juno (2007), Jennifer's Body (2009) (which Reitman produced), and Young Adult (2011), the last of which also starred Theron.


Marlo is pregnant with an unplanned third child with her husband Drew. Their oldest child, Sarah, is neurotypical, whereas Jonah, their son, has a developmental disorder doctors have not been able to diagnose; trying to reduce his sensitivity to external stimuli, she brushes his skin using the "Wilbarger protocol". Craig, Marlo's wealthy brother, offers to pay for a night nanny as a baby gift, partly as she experienced postpartum depression after giving birth to Jonah, but she rebuffs him.