Along with the rapidly changing social and economic context accompanied by COVID-19, concerns have been raised for the less-educated, low-wage workers who disproportionately experienced disadvantages in accessing workplace learning or training opportunities essential for job placement or career development. In response to the challenges of increasing discrepancies in workplace learning opportunities, this paper suggested workplace learning as an area that needs more attention from multidisciplinary perspectives to support the needs of disadvantaged populations. The authors reviewed research trends on workplace learning from adult education (AE) and human resource development (HRD) disciplines and discussed common areas and research gaps. The paper suggested advancing workplace learning theories and building empirical evidence for disadvantaged populations in various workplace contexts through complementary collaboration between AE and HRD.