Background: The diagnosis and treatment of lung cancer necessitate a variety of supportive care needs. To our knowledge, no studies have been conducted that target specifically the supportive care needs of patients with lung cancer in Mainland China. Cross-cultural studies indicate that supportive care needs vary by cultural background. Thus, it is necessary to investigate the supportive care needs of patients with lung cancer in the cultural context of China., Purpose: This study aimed to describe the level of supportive care required by patients with lung cancer in China and to examine the relationships between supportive care needs and demographic factors and between supportive care needs and treatment variables., Methods: A cross-sectional descriptive study design was adopted. Five hundred fifty-four patients with lung cancer were recruited using a convenience sampling method from inpatient departments in four tertiary teaching hospitals that are affiliated with a medical university in Anhui Province, China. The Nursing Professional Social Support Needs Scale and background information list were used as the data collection instruments. A Wilcoxon rank sum test and a Kruskal-Wallis rank sum test were conducted to examine the differences among the professional supportive care needs of patients of different demographic characteristics and under different treatment conditions., Results: Participants self-reported the highest scores in the domain of informational needs (M = 3.67, interquartile range = 1.25). The most common supportive care need was "to be cared for by nurses with skilled venipuncture techniques." There were significant differences in needs across different genders, age groups, educational levels, and income levels (p < .05). Patients with metastasis and other illnesses had greater supportive care needs in terms of total and subscale scores in Stages III and IV (p < .05)., Conclusions: Patients with serious diseases and heavy socioeconomic burdens have greater supportive care needs. Therefore, healthcare providers should improve their awareness and expertise to identify the needs of their patients and to provide supportive care to patients with lung cancer. In addition, patients with high supportive care needs should be identified.