Toronto-Dominion Bank (French: Banque Toronto-Dominion), doing business as TD Bank Group (Groupe Banque TD), and commonly known as just TD, is a Canadian multinational banking and financial services corporation headquartered in Toronto, Ontario. The bank was created on February 1, 1955, through the merger of the Bank of Toronto and the Dominion Bank, which were founded in 1855 and 1869, respectively. It is one of two Big Five banks of Canada founded in Toronto, the other being the Canadian Imperial Bank of Commerce.

In 2021, according to Standard & Poor's, TD Bank Group was the largest bank in Canada by total assets and also by market capitalization, a top 10 bank in North America, and the 23rd largest bank in the world. In 2019, it was designated a global systemically important bank by the Financial Stability Board. In 2023, the company was ranked 43rd in the Forbes Global 2000.

The bank and its subsidiaries have over 89,000 employees and over 26 million clients worldwide. In Canada, the bank operates through its TD Canada Trust division and serves more than 11 million customers at over 1,060 branches. In the United States, the company operates through their subsidiary TD Bank, N.A., which was created through the merger of TD Banknorth and Commerce Bank. TD Bank serves more than 6.5 million customers in the United States with a network of over 1,171 branches in 16 states and the District of Columbia.

The predecessors of the Toronto-Dominion Bank, the Bank of Toronto, and the Dominion Bank were established in the mid-19th century, the former in 1855 and the latter in 1869. In 1954, an agreement was reached to merge the two financial institutions. The merger was later accepted by the Canadian minister of Finance on November 1, 1954, and was made official on February 1, 1955. The new institution adopted the name Toronto-Dominion Bank. The two banks were of similar size and had healthy balance sheets at the time of the merger. They were among Canada's smaller banks; their desire merge was to compete with the larger banks. The combined Toronto-Dominion Bank became the fourth largest bank in Canada, with assets of $1.1 billion.

In 1967, TD Bank opened its new head office, the Toronto-Dominion Centre in downtown Toronto. In the next year, the bank entered into a partnership with Chargex (later known as Visa Inc.). The TD Bank shield logo was unveiled to the public near the end of the decade, in 1969.

In 1976, TD Bank piloted its first automated teller machine (ATM), the TD 360, which was renamed the Green Machine, a name it continues to carry.

In 1987, Toronto Dominion Securities Inc. was established by the bank. TD Bank saw growth in the 1990s, with the acquisition of several financial assets including the commercial branches of Standard Chartered Bank of Canada. In 1992, the bank acquired the assets and branches of Central Guaranty Trust, as well as Waterhouse Investor Services in 1996.

In 1992, TD Bank and G4S Cash Solutions, a subsidiary of British security services company G4S plc, began a pilot project in Toronto that developed into a nationwide partnership in 1997. G4S Cash Solutions secured the contract to transport cash and provide first-line maintenance for the bank's ATMs – both cash dispensing and deposit pick up units." By 2010, the partnership had expanded where G4S Cash Solutions operated 2,577 ATMs, 1,093 branch night deposits, 95 weekly balanced cash dispensers as well as eight cash dispensers for branch tellers and 100 across the pavement services and hosted a discussion on the introduction of polymer banknotes in 2011 with leading Canadian financial institutions.