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Objective(s): Encapsulated pharmaceuticals are presently the object of comprehensive investigations in many research centers due to their increased therapeutic efficiency, bioavailability, and high dissolution rate. There are different procedures for encapsulation and choice of procedure influences the size of particles for intended applications. Methods: In this study, Nanocapsules of Poly-Lactic-co-Glycolic Acid (PLGA) containing Bovine Serum Albumin (BSA) at ratios of 0.25/0.25, 0.4/0.1 and 0.45/0.05 were fabricated by electrospraying method. Also, the effect of some parameters in electrospraying was evaluated, including PLGA concentration, voltage and flow rate on the morphology and size of particles.  Results: BSA loaded PLGA Nanocapsules were successfully prepared by using electrospraying technique. The formation of capsules was confirmed by TEM. SEM results of the samples showed that decreasing the flow rate and increasing voltage decreased the average size of nanocapsules and led to producing the capsules with a size in the range of 85-260 nm. The presence of the drug in nanocapsules was confirmed by DSC results. Drug release test showed that about 90% of BSA had been released during 24 h. Conclusions: PLGA nanocapsules containing therapeutic proteins were produced by the electrospraying technique under different operation parameters and physical properties.