Tehran University of Medical Sciences Auditory and Vestibular Research 2423-480X 30 1 2021 01 06 9 17 Mahdieh Hasanalifard New Hearing Technologies Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran AND Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Younes Lotfi Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Abdollah Moossavi Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran 2020 10 06 2020 12 21 Background and Aim: In a bimodal fitting, one ear is stimulated acoustically with a hearing aid and the other is stimulated electrically with a cochlear implant. This paper provides a brief summary of the concept of bimodal fitting, binaural hearing and its importance, the hearing benefits of binaural hearing in bimodal fitting, candidacy and hearing aid adjustment in bimodal fitting cases. Recent Findings: Researches have shown that bimodal fitting offers a wide range of hearing benefits over unilateral cochlear implants, such as better speech perception in noise, better musical perception, and a better understanding of pitch and tone perception and naturalness of sound perception. Conclusion: Considering the binaural hearing advantages in bimodal fitting users, it can be concluded that users of unilateral cochlear implants who have measurable residual hearing in their non-implanted ear can use a hearing aid in that ear and enjoy binaural hearing advantages. The hearing aid should be fitted in a way to complement the information obtained through cochlear implantation. https://avr.tums.ac.ir/index.php/avr/article/view/882