The mechanical and physical properties of various weigh percent’s (% 0 - % 40) of the olive pomace flour (OPF) loaded linear low density polyethylene (LLDPE) in the presence of % 0, % 5 and % 10 coupling agent (C) were formulated and studied. Extrusion and hot press processing techniques were used to fabricate OPF/LLDPE composites. Tensile stress at yield increased by % 20 with the increasing of the filler loading up to % 20; and marginally increased in the presence of the C. Whereas, the decline in the tensile strain at yield of the polymer composite improved with the increase in the C content. The modulus increased from 631 MPa for the neat LLDPE to 680, 808, 700 MPa for the filled composite at % 5, % 10 and % 20 filler content’s, respectively. Whereas, a decrease in the given modulus (550 MPa) was observed at % 40 filler loading. The modulus has shown a successive improvement upon the addition of the C with values not less than 800 MPa. The impact strength decreased with the increase in filler loading from 119 kJ/m2 for the neat LLDPE to 81, 43, 27 and 16 kJ/m2 for the % 5, % 10, % 20 and % 40 OPF/LLDPE samples, respectively. On the contrary, % 10 C addition improved the impact strength of the composite by two folds in the case of 10 - 40 % filler inclusion. Scanning electron microscopic (SEM) illustrations proved the mechanical performance of various bio-composite formulations. Water absorption of the bio-composite increased with the OPF loading, from % 0.73 for the neat LLDPE to % 2.6 for % 40 OPF filled polymer composite, and decreased upon increasing the C content with an average of % 1.4 for all composites. Bio-composite formulated by mixing cellulosic based material OPF and LLDPE demonstrated compatible physical properties and can be used as an already available cellulosic filler for the bio-composite materials.