Abstract Objective: To demonstrate evidence from available clinical studies to clarify the scientific points that have been achieved in relation to thyroid disorders and ejaculatory dysfunction. Data sources: Clinical trial articles published in English on Medline. Eligibility criteria: Clinical studies that investigated the association of thyroid disorders with the ejaculatory function of subjects and the trials evaluating the effect of thyroid dysfunction treatment on the ejaculatory function of the subjects were eligible. Synthesis methods: We searched Medline with “ejaculation” and different combinations of “thyroid,” “serum TSH,” “serum T3,” “serum T4” keywords in PubMed. Results: Standardized mean serum thyroid-stimulating hormone (TSH) levels in premature ejaculation (PE) sufferers differed from non-PE control subjects (p=.05). Hyperthyroidism was associated with increased odds among PE subjects (OR=2.0, p=.03). Delayed ejaculation was seen with increased odds in hypothyroid patients compared with hyperthyroidism patients (OR=57, p=.0001). Serum TSH and mean intra-vaginal ejaculation latency time (IELT) of the subjects showed a correlation both before and after treatment for thyroid disorder. Treatment of thyroid disorders improved the mean IELT measures of the subjects. The overall estimate of the effect of hyperthyroidism treatment on mean IELT was .64 (p=.0001) in the random-effects model. Limitations: The low quality and quantity of evidence from available studies limited the interpretation of our study findings. Conclusions: The causal relationship between ejaculatory dysfunction and thyroid disorders remains to be clarified. Sufferers of delayed ejaculation acquired PE subjects, and PE sufferers who have accompanying erectile dysfunction and/or anxiety may benefit from thyroid disorder investigation.