The utilization of a professional geoscience career panel as a curricular classroom activity can be essential for promoting career awareness. By interacting with professionals, students can be exposed to diverse geoscientific careers, helping them understand various professional paths and the real-world applications of their studies. Using social constructivism and critical reflection theories of learning, we designed and implemented a two-day career panel attended by ten ocean scientists in an undergraduate oceanography course for majors and non-majors. We used a qualitative, quasi-experimental design involving pre-and-post reflection data collected from the treatment group (n = 22) and control group (n = 19), and five post-treatment interviews to evaluate the effectiveness of the career panel on students' ocean science career awareness. While the pre-reflections revealed that students in both the treatment and control groups had low awareness and knowledge about ocean science careers and practice, students in the treatment group showed improved awareness about ocean science careers and disciplines, processes of ocean science work, and the social and cultural impact of ocean science work after attending the career panel. Students in the treatment group also showed increased interest in ocean science and geosciences in general. Results indicate classroom career panel that include personal narratives, discussions, and students' critical reflections can be effective tools to promote career awareness and interest in the geosciences. We provide implications for geoscience education such as supplementing classroom career panel with hands-on activities (e.g., job simulations), advanced organizers (e.g., worksite visits), and experiential learning opportunities (e.g., internships) as instructional tools to promote students' career awareness.