This study examines the varying relationships between vocational identity and differentiation of vocational interests while taking into account levels of profile elevation as the moderator. The participants were 130 high school students who attended a vocational guidance programme at a youth counselling centre in Korea. The relationship between differentiation and vocational identity was found to be weak positive. Differentiation appeared to be an indicator of vocational identity for students with low and medium profile elevation, but not for those with high profile elevation. The results are compared to previous findings and the implications for Holland's theory and vocational guidance and counselling are discussed. (Contains 2 tables and 1 figure.)