Objective: Informal caregivers of people with lung cancer often experience a substantial care burden and associated negative consequences due to the often‐contracted course of the disease. The objective of this review was to systematically examine the evidence on the factors associated with lung cancer caregiver distress. Methods: Five databases (MEDLINE, CINAHL, EMBASE, PsychINFO and Web of Science) were searched for studies investigating factors associated with distress amongst caregivers of people with lung cancer.