This study investigates the effect of deposit money banks' efficiency on financial, inclusion in Nigeria for the period 2006 to 2013. A non-parametric output-oriented variable return-to-scale Data Envelopment Analysis (DEA) approach is employed to ascertain the technical efficiency of these banks, from which the efforts at ensuring financial inclusion are inferred. The study found that deposit money banks in Nigeria are technically efficient, but individually inefficient, as an industry as well as a sector of the economy in ensuring financial intermediation. This result of technical inefficiency is also complemented by the findings of profit inefficiency for the period under investigation through the use of Financial Ratio Analysis (FRA) approach. On the whole, the results show that both the DEA and the FRA approaches are found complementary rather than competing measures. The study shows that even though the number of depositors and the number of bank branches have reasonably improved, the financial intermediation drives of the deposit money banks are still weak. Therefore, the study recommends that the central bank should regulate the deposit money banks in employing a stakeholder's perspective to financial inclusion and not a selective one which is currently being undertaken by the banks. Also, socioeconomic infrastructure should be developed by the government to enhance banking spread far and wide, while proper orientation and incentive, if need be, should be given to encourage the savings habit of the populace.