Background: Palliative care aims to improve life quality of patients and their families, preventing and relieving people's suffering in coping life-threatening diseases. Many challenges are linked to palliative care, such as the lack of specific disciplines in doctors training; the scarcity of services and specialized programs in palliative care in public and private health systems and the lack of training for resident doctors. Objective: To identify knowledge of resident doctors regarding palliative care. Method: A systematic review according to PRISMA (2009), with searches carried out in Cochrane Library, MEDLINE / PubMed, Scopus, Web of Science databases and gray literature of Brazilian Digital Library of Theses and Dissertations (BDTD), with the acceptance of articles in English, Portuguese and Spanish, without delimitation of publication date, geographic location and type of study. Only studies with resident doctors were included. Results: During the search, 931 articles were found. Of these, 363 were discarded because they were duplicated and 568 were discarded after reading titles and abstracts, leaving 24 articles for complete reading, which after reading and consensus of the three researchers, only 07 of these articles were included in the comparative synthesis. Three intervention studies, two cross-sectional and two qualitative studies were found. In the observed data, all the analyzed studies had a sample of less than 100 subjects, with a total of 442 subjects, of which 137 (30.99%) were women and 111 (25.12%) men, with average age ranging from 26.6 to 32.1. Conclusions: The studies analyzed in this review indicate that the knowledge of resident doctors was limited and insufficient related to palliative care, what indicates the need of greater investments in training, through teaching-learning methods based on rotation, simulation and others, thus improving not only knowledge, but also the practice in palliative care. PROSPERO record: CRD42020159428