This paper investigates how the mobility inequality of the disadvantaged is negatively influenced by urban socio-economic and land-use development in Hong Kong. The first part reviews the concepts of equality, mobility and the influence of socio-economic and land-use development on the mobility of the disadvantaged. The latter part investigates mobility provisions of the Mass Transit Railway and bus services by means of route tests. The findings of the route tests show that mobility inequality existed among the disadvantaged and the better-off in Hong Kong. This paper concludes that mobility inequality of the disadvantaged is due to the negative influences of socio-economic and land-use policies and developments.