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<p>This study was conducted to determine the effect of a selenium (Se)-enriched yeast-based diet on the performance; blood biochemistry; and Se concentration in the eggs, breast muscle, and some internal organs of laying Japanese quails. A total of 320 healthy female quails were randomly selected and assigned to four dietary groups. The dietary treatment groups consisted of a standard basal diet (control) without supplementation of Se-enriched yeast (SY) and other groups in which Se was supplemented at 1.5 mg (SY-1.5), 2.5 mg (SY-2.5), and 3.5 kg<span class="inline-formula">⁻¹</span> (SY-3.5). Results showed that quails in SY-3.5 had high (<span class="inline-formula"><i>p</i><i>&lt;</i>0.05</span>) body weight gain. Egg production was improved in SY-2.5 and SY-3.5 groups compared to in the control. Significantly (<span class="inline-formula"><i>p</i><i>&lt;</i>0.05</span>) higher contents of Se in yolk and albumen were observed in the SY-3.5 group. The Se concentration of the breast muscle was higher (<span class="inline-formula"><i>p</i><i>&lt;</i>0.05</span>) in quails of the SY-3.5 group, whereas the liver, kidney, and heart had a high Se content in the SY-2.5 and SY-3.5 groups. Intestinal histological features were improved (<span class="inline-formula"><i>p</i><i>&lt;</i>0.05</span>) in the SY-3.5 group. Overall, this study suggests that adding SY-3.5 to the diet of quails improved their growth and health, as well as the Se content in eggs and meat.</p>