Polycystic ovarian syndrome (PCOS) is a group of clinically distinct endocrine conditions. Insulin resistance-related proteins are involved in PCOS pathogenesis. Irisin is a new myokine that functions similarly to adipokines. Irisin has been linked to insulin resistance and metabolic syndrome. There have been conflicting findings regarding irisin levels and their connection to hormonal and metabolic alterations in PCOS .This study aimed to compare the levels of irisin in follicular fluid and serum between women with PCOS and healthy women and correlate them with oocyte and embryo quality in women undergoing the ICSI cycle .Ninety infertile Iraqi women were enrolled, 46 women with PCOS and 44 weight-matched non-PCOS controls, in whom ICSI was done for them and evaluated the level of follicular fluid, serum Irisin, and insulin level with measure of Homeostasis Model of Assessment-Insulin Resistance (HOMA-IR) and correlate them to with oocyte and embryo quality. HOMA-IR, FF, and serum irisin levels in PCOS considerably increased. (P ≤ 0.01). In addition, there was a significant negative correlation between Irisin levels in follicular fluid and serum with MII oocyte, oocyte maturity rate, and grade 1 embryo. The serum, follicular fluid Irisin, and HOMA-IR were significantly higher in PCOS than in control cases, which may cause a reduction in oocyte maturation, embryo quality, and pregnancy outcome.