ObjectiveWe evaluated the relation between urine concentrations of phytoestrogens and risk of incident type 2 diabetes (T2D) in middle‐aged and older Chinese.Methods: Urine phytoestrogen metabolites (including isoflavones and lignans) were assayed by HPLC among 564 T2D cases and 564 controls in a nested case‐control study within the Singapore Chinese Health Study. Morning urine samples were collected from participants free of diagnosed diabetes, cardiovascular disease and cancer (1999‐2004). Incident self‐reported T2D cases were identified during the follow‐up at 2006‐2010, and controls were matched for age and date of urine collection, sex and dialect group.Results: The multivariate‐adjusted odds ratios (ORs) and 95% confidence intervals (CIs) across quartiles of urine isoflavones were 1.00, 0.76 (0.52‐1.11), 0.78 (0.53‐1.14) and 0.79 (0.54‐1.15), respectively (P‐trend=0.54); and the ORs (95% CIs) for lignans were 1.00, 0.87 (0.60‐1.27), 1.10 (0.77‐1.56) and 0.93 (0.63‐1.37), respectively (P‐trend=0.93). No significant associations were found for individual metabolite of isoflavones (genistein, daidzein, glycetin, and equol) or lignans (enterodiol and enterolactone).ConclusionsThe present study did not find a significant relation between urine concentrations of phytoestrogen metabolites andT2D risk in Chinese population.Funding sources: The study was supported by NIH R01 CA144034 and UM1 CA182876, and Singapore Tier 1 grant.