This study evaluates the effects of carvacrol, used in hyperthyroidism, on ovarian reserve as well as inflammatory and oxidative stress. In the study, thirty-five female Wistar albino rats were randomly divided into groups with an equal number of animals in each group: control, solvent, hyperthyroidism, carvacrol, hyperthyroidism+carvacrol. At the end of the study, oxidative stress (MDA, GSH) and inflammatory cytokine (TNF-α and IL-6) analyses were performed in ovarian and uterine samples, while hormone (T4 and AMH) measurements were performed in the blood. In the hyperthyroidism group, ovarian and uterine MDA levels increased, GSH levels decreased, ovarian TNF-α and IL-6 levels increased, while AMH levels remained unchanged. In the oxidative stress and inflammatory state caused by hyperthyroidism, carvacrol treatment showed antioxidant and anti-inflammatory effects but did not cause any statistical difference in ovarian reserves. In conclusion, it is thought that carvacrol has beneficial effects on ovarian activities in hyperthyroidism. However, it would be helpful to investigate different doses and carvacrol treatment regimens and carry out clinical studies.