BackgroundThis study aimed to examine the relationship between nursing students’ perceived parental child-rearing attitude, ego identity, and college adjustment in Korea and explore factors that influence college adjustment.MethodsThis study surveyed 224 nursing students enrolled in universities located in two regions within South Korea. Data were collected from October 14 to November 31, 2019. Perceived parental child-rearing attitude (paternal emotional warmth, paternal rejection, paternal overprotection, maternal emotional warmth, maternal rejection, and maternal overprotection) and ego identity of nursing students were used as independent variables on college adjustment. Collected data were subjected to correlation analysis using SPSS version 26.0 for Windows. Further, regression analysis was performed on the influence of parental child-rearing attitude and ego identity on college adjustment.ResultsAmong the parental child-rearing attitudes, paternal emotional warmth (r = .30, p < .001), maternal emotional warmth (r = .38, p < .001), and ego identity (r = .71, p < .001) were positively correlated with nursing students’ college adjustment, whereas maternal rejection was negatively correlated with ego identity (r = − .28, p < .001) and college adjustment (r = − .15, p = .025). Regression analysis of the effects of nursing students’ perceived parental child-rearing attitude and ego identity on college adjustment, with grade as a control variable, revealed that ego identity (p < .001) had a significant effect on college adjustment, and the higher the ego identity (β = 0.712), the higher the college adjustment. Further, the explanatory power of explaining college adjustment was high at 49.9%.ConclusionsThe nursing students’ perceived paternal emotional warmth, maternal emotional warmth, and ego identity were positively correlated with college adjustment. Additionally, ego identity was found as the influencing factor in Korean nursing students’ college adjustment. Therefore, programs to strengthen ego identity should be developed and implemented for college adjustment among nursing students.