Older adults with mild cognitive impairment (MCI) are at increased risk of progression to dementia. Whether it is feasible to engage this population in expressive arts therapy and yield effects on cognition and depression for older adults with MCI remained unclear. The aim of this study examined the effects of expressive arts therapy on the cognitive function and depression levels of older adults with MCI in day care centers in Taiwan. A quasi-experimental design was conducted in a sample of day care centers older adults with MCI. A total of 88 participants with MCI were assigned to the intervention or comparison group. The intervention groups participated in an expressive arts therapy for 12 weeks in addition to their daily activities. Data were collected at the baseline point and immediately after post-intervention. Generalized estimating equations were used to examine the effect of the intervention on the outcomes. At week 12, findings indicated that the intervention group had significant improvement in cognitive function and depression over time than the comparison group. These findings provide evidence for the feasibility and efficacy of expressive arts therapy intervention in older adults with MCI.