This experiment was conducted to evaluate the effect of adding some herbal feed additives (HF A) [thyme (T, Thymus Vulgaris L.), dianthus (D, Delphinum Ajaews), and fennel (F, Foeniculum Vulgare L.)] at a level of 10g/kg to Japanese quail diets on performance and some metabolic functions. Adding HFA to the control diet improved (P<0.05) body gain, feed intake and feed conversion (feed/gain) efficiency. The birds fed dietary F additive exhibited the best (P<0.05) values of these parameters during the entire period (0 to 6 weeks of age), compared with other dietary treatments. There was an improvement (P<0.05) in total protein, globulin, and albumin for birds fed dietary T or F at six weeks of age. Birds fed on dietary F recorded the lowest (P<0.05) value of these components compared with other dietary treatments.