The Brocklebank Line (formally named Thos. and Jno. Brocklebank) was an English shipping line that operated during the 19th and 20th centuries.
Daniel Brocklebank founded a shipyard in Whitehaven in 1785, and expanded in the following years into operating ships. Following Brocklebank's death in 1801, his sons Thomas and John took over the business, which was incorporated as Thomas and John Brocklebank. The line expanded steadily in the first half of the 1800s, opening routes to South America by 1809, India in 1815 following the end of the East India Company's monopoly, and China in 1829. The line's operations were based out of Liverpool and run by Thomas Brocklebank, while John ran the Whitehaven shipyard until his death in 1831. The next generation of Brocklebanks, Thomas Jr. and Ralph, became partners in the business in 1843, and the following year the line reached its peak with a fleet of fifty ships.
In 1865, the shipyard at Whitehaven closed, with most of the line's subsequent ships built at Harland & Wolff. In 1911, the Brocklebank family gave up full control of the company, when Sir Percy, Frederic and Denis Bates—descendents of shipping magnate Sir Edward Bates—acquired a stake in the line. In 1912, the Anchor Line, a Cunard Line subsidiary, took a controlling interest in Brocklebank. In 1916, Brocklebank purchased the Wells Line, and came under the control of Cunard in 1919 when the latter purchased the entirety of the Brocklebank and Bates families' shares. After retraction during the 1930s, Cunard purchased the remaining outstanding Brocklebank stock in 1940, and while the line lost the majority of its ships ships during World War II, it rebuilt following the war. In 1967, a Cunard restructuring led to a renamed Cunard Brocklebank Line taking over all of Cunard's cargo traffic. Cunard suffered financially in the following years, however, and the freight business was eventually shuttered, with the last Brocklebank–flagged ships sold in 1983.