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Background and purpose: Osteoporosis and periodontitis are two diseases associated with bone loss and are common among postmenopausal women. There are many contradictory results on the effect of osteoporosis on periodontal tissue. This study aimed to determine the association between osteoporosis and periodontal status in postmenopausal women. Materials and methods: This cross-sectional study was part of the second phase of the Amir kola Health and Aging Project (AHAP), in which 210 postmenopausal women were randomly divided into three groups (n=70 per group); normal bone density group, osteopenic group, and osteoporotic group. Periodontal status was measured using Periodontal Disease Index (PDI), Plaque Index (PI), and Simplified Oral Hygiene Index (OHI-S). Bone mineral density (BMD) was measured by Dual-energy X-ray absorptiometry (DEXA). Data were analyzed in SPSS V17 applying ANOVA, Kruskal-Wallis, and Pearson correlation coefficient. Results: The average age of the participants was 65.24±4.36 years. There were no statistically significant differences between the mean OHI (2.26±1.40), PDI (2.76±1.42), and PI (1.23±0.87) in the osteoporotic group, and the mean OHI (2.01±1.62), PDI (2.56±1.61), and PI (1.35±0.91) in the osteopenia group, and mean OHI (1.73±1.37), PDI (2.47±1.43), and PI (1.23±0.87) in the normal group (P>0.05). The OHI, PDI, and PI had a slight but insignificant negative correlation with BMD. Conclusion: According to this study, there is no link between osteoporosis and periodontal status in postmenopausal women.