This study examined the effects of cross boarder banking on the growth of deposit money banks in Nigeria. The objective was to examine the relationship that exists between Nigeria cross boarder banking and deposit money banks in Nigeria. Time series data was sourced from Central bank of Nigeria statistical bulletin. Growth of Nigerian deposit money banks was modeled as the function of cross boarder credit, cross boarder banking claims, cross boarder banking assets, cross boarder banking liabilities and cross boarder bank branches. The ordinarily least square method was used as data analysis method. Findings shows that cross boarder bank branches, cross boarder banking liabilities and cross boarder banking assets have positive relationship with the growth of Nigerian deposit money banks while cross boarder bank credit and cross boarder banking claim have negative effect on the growth of Nigerian deposit money banks. The study concludes that cross boarder banking have moderate effects on the Nigerian deposit money banks. We recommend that international financial policies such as cross boarder banking should be formulated by management of deposit money banks and regulatory authorities to achieve positive impact of cross boarder banking on the growth of Nigeria deposit money banks.