Objective: This research was conducted in order to compare mental health, psychological capital, and marital intimacy in mothers of children with hearing impairment, those with intellectual disabilities, and normal children. Method: The statistical population of the present descriptive-comparative study consisted of all mothers of children with hearing impairment (n=50), those with intellectual disabilities (n=50), and normal children (n=50) in care centers and primary schools of Khoy, Iran, in 2016. From this population, a sample of 120 people (40 per group) was selected using simple random sampling. Participants completed the General Health Questionnaire (GHQ), Luthans’ Psychological Capital Questionnaire (PCQ), and the Marital Intimacy Scale (MIS). Data were analyzed in SPSS 21 using MANOVA and one-way ANOVA with Scheffe post-hoc test. Results: Data analysis showed a statistically significant difference between mothers of children with intellectual disabilities and those with hearing impairment on the one hand, and mothers of normal children on the other, in terms of general mental health (f=12.20, p=0.0001) and psychological capital (f=14.36, p=0.0001(. However, there was no difference between the three groups in terms of marital intimacy (f=0.603, p=0.508). Conclusion: Mothers of children with mental disabilities and those with hearing impairment have a lower mental health and psychological capital than mothers of normal children, but mothers of all three groups have the same level of marital intimacy.