The aim of the current study was to assess the feasibility and preliminary efficacy of utilizing an online Cognitive Behavioral Therapy for Insomnia (CBT-I) program in bereaved older adults (ages 55 and older). Participants were randomized to receive either a 6-week online CBT-I program or six weeks of online psychoeducational modules on insomnia and grief. The sample included 30 adults with mild to severe symptoms of insomnia. Results suggest that the study was feasible to conduct, as evidenced by the brief 5-week recruitment time, 87% retention rate, and 100% completion rate of the intervention modules. There were no treatment effects by time difference shown in the study and no significant differences in study outcomes were found between the CBT-I and control groups, as both demonstrated similar improvements in insomnia. However, this study suggests that it is feasible to recruit bereaved older adults for an online educational program and successfully administer an online protocol targeting insomnia and well-being.Copyright © 2020 Elsevier Inc. All rights reserved.