Few studies have been conducted on individuals’ knowledge of sport-related concussions (SRCs) in South Korea. The purpose of this study was to examine South Korean athletes’ knowledge and recognition of SRC. A cross-sectional survey assessing (a) the recognition of specific signs and symptoms associated with SRC; (b) history of SRC; and (c) knowledge of the return-to-play decision (RTP) process after SRC was distributed to 410 high school and collegiate student-athletes from a variety of sports. No participants correctly identified all 9 items on the checklist of SRC signs and symptoms. While 8.9% reported a history of SRC, approximately 50% of those never reported their postconcussion signs and symptoms. Furthermore, 63.9% of the athletes who reported SRC made RTP decisions on their own. These results reflect the lack of knowledge in South Korean athletics of common signs, symptoms, and appropriate RTP decisions following concussion.