The treatment of ovarian cancer is a major challenge in oncology as mortality from ovarian cancer remains very high. The immune system plays a critical role in controlling cancer through a dynamic relationship with cancer cells. Immunotherapy can establish a sustained immune system response against recurring cancer cells leading to long-term remissions for ovarian cancer patient. The use of immune checkpoint inhibitors, which work by targeting molecules that serve as checks and balances in the regulation of immune responses, might be a promising avenue of immunotherapeutic research in ovarian cancer. In this review, we have focused on the potential of certain immune checkpoint inhibitors, such as anti-cytotoxic T lymphocyte antigens, anti-programmed death agents, and anti-program death ligands against ovarian cancer, with their mechanism of actions. Also, the problems arising due to checkpoint inhibitor immunotherapy have been discussed in this review. Checkpoint inhibitor immunotherapy is still in early-phase testing for ovarian cancer. Understanding the pivotal role of the tumor microenvironment in suppressing anticancer immunity, the unique adverse effects profiles of these agents, and the exploration of combinatorial treatment regimens will ultimately lead to enhance the efficacy of ovarian cancer immunotherapies and improved patient care.