Background: Persons bereaved by suicide are reluctant to ask for social support when they experience feelings of guilt and blame. A web-based peer forum may provide a safe and anonymous place for mutual support. Aims: This study examined the mental health changes of visitors of two online support forums for persons bereaved by suicide and their experiences with the forum over 1 year. Method: Visitors of two forums completed self-report measures at baseline and at 6 and 12 months' follow-up. Repeated measures analyses were used to study changes in well-being, depressive symptoms, and complicated grief. Additionally, participants were interviewed about their experiences with the forum. Results: The 270 participants were mostly female, low in well-being, with high levels of depressive symptoms and complicated grief. Suicidal risk was high for 5.9%. At 12 months, there were small to medium-sized significant improvements in well-being and depressive symptoms (p <.001) and nearly as much for grief (p =.08). About two thirds reported benefit from visiting the forum. Because of the pre-post design we cannot determine whether a causal relationship exists between the form and changes in mental health. Conclusion: After 1 year some positive changes but a large group was still struggling with their mental health. Interviews indicate that the forum was valued for finding recognition.