Lignin derived from rubberwood was added to natural rubber latex as a filler and its influence in affecting the surface morphology and strength of the resulting films was investigated via scanning electron microscopy, tensile strength measurements and XRD analysis. The SEM results indicated random dispersion of lignin in the unaged lignin filled rubber films, in which most films exhibited rougher and incoherent surfaces in comparison to control rubber films. Upon ageing at 70 °C for seven days, the lignin filled rubber films displayed changes from relatively rougher surfaces to smoother surfaces. Results suggest that the most obvious influence of lignin is the increment in tensile strength. This increment in strength is particularly obvious with lignin filled rubber films at loading of 10 and 12 weight percent. Consequent increase in tensile strength values after ageing is shown by lignin filled rubber films at a 12 loading. The results of crosslink density obtained from stress-strain data infer that the addition of lignin increased chain entanglement in unagedfilms as indicated by the C2 values. Further analysis using XRD revealed observable changes in the amorphous rubber peak at 2θ = 18.