Diamond Bank, headquartered in Lagos, Nigeria, was a commercial bank that operated in the Nigerian financial market. Established in 1990, Diamond Bank quickly positioned itself as one of the leading banks in the country, offering a wide range of products and services to its customers. The bank's headquarters, located in Victoria Island, Lagos, showcased its commitment to providing convenient banking services to its customers.

With a network of over 280 branches spread across Nigeria, Diamond Bank aimed to offer easy access to banking services for both individuals and businesses. Diamond Bank focused on delivering innovative financial solutions to its customers. Its main products and services included personal and corporate banking, loans and advances, investment banking, retail banking, international banking, asset management, and electronic banking.

The bank also offered various insurance products through its subsidiary, Diamond Assurance. Although Diamond Bank primarily operated within Nigeria, it had a subsidiary with operations in the United Kingdom. Diamond Bank UK provided banking services to Nigerians in the diaspora and served as a strategic partnership to foster trade relations between Nigeria and the UK.

In terms of its market position, Diamond Bank was considered one of the top banks in Nigeria. It had a significant market share and competed with other major banks, such as Zenith Bank, First Bank of Nigeria, and Access Bank. The bank consistently aimed to enhance customer experience through digitization and technological advancements.

Diamond Bank underwent a significant change in strategy in 2019 when it merged with Access Bank, creating one of Africa's largest financial institutions. This strategic move aimed to optimize operational efficiencies, strengthen their market position, and deepen their financial services offerings. As of the latest available information, Diamond Bank ceased to exist as an independent entity after the merger with Access Bank.

Customers and operations of Diamond Bank have been fully integrated into Access Bank, creating a stronger and more diverse banking institution in Nigeria and across the African continent