The research involved characterization of banana fibers for their properties which included themorphology, chemical analysis, thermal properties, and the effects of treatment on the above.Chapterone covers a background to the research and two contains a review of the published literature relating tothis subject.The literature review was used as the guidance in the thesis in design, analysis, andprojection of the expected trends.The methodology for the experimental work conducted is detailed inchapter three while the results and discussions of the effects of pre-treated banana fibers on theirproperties and the performance of the composites follows in chapter four.This thesis ends with adiscussion on the results including conclusions and recommendations for future work.Data of testsappear in the Appendices.The fiber density testing showed that the treated fibers had higher densitythan untreated ones.X-ray diffraction (XRD) carried out to assess modification of the fiber crystallinityshowed that banana fiber crystallinity index increased in all the treated fibers, thermogravimetricanalysis (TGA) which was used to obtain the activation energies and relative thermal stability of fibersindicated that all treatments improved fibre thermal stability.Single fibre tensile testing that was done toobtain the tensile strength of untreated and treated fibers indicated that the alkali treatment enhanced thetensile strength of the fibers and silane treatment has minimal effect on the fiber tensile properties.