ABSTRACT The present paper pointed to investigate the effects of L-carnitine on broiler performance, carcass traits and some blood biochemical measurements. A total of 120 Ross chicks provided from hatchery, distributed randomly into four groups (30 chicks each) 3 replicates / each (10 chicks each). The 1st was control group and received basal diet, 2nd, 3rd and 4th groups fed basal diet containing 0.25, 0.5 and 0.75 g of L-carnitine per kg diet. Results showed that body weight (BW) at 42 days old and daily body weight gain (DBWG) through 21-42 and 1-42 days old showed promoting impact of checks received 0.25, 0.5 and 0.75 g L-carnitine /Kg diet than control group. Feed intake (FI) and feed conversion ratio (FCR) reducing significantly (P<0.05) compared with control group during stage 21-42 days of age. Comparative weights of carcass, dressing, giblets and liver were increased (P<0.05 and 0.01) by adding L-carnitine levels into broiler chicks diet compared with the control. The highest values of most mentioned relative weight were recorded with chicks group fed on diet containing 0.75 g L-carnitine /Kg diet confront with the control. Blood plasma Total protein enhanced (P<0.05) by L-carnitine addition, total cholesterol (TC), triglyceride (TG), low density lipoprotein (LDL) and glucose values decreased significantly (P<0.01 or 0.05) in groups fed diet plus various levels of L-carnitine than control group .From the above results, can be concluded that L-carnitine had low role of promoting broiler performance, while it improved carcass characteristics and blood biochemical estimations specially lipid profile. Keywords: Broiler; growth performance; carcass characteristics; blood estimations.