The house flag of the Orient Steam Navigation Co. Ltd, London. A white flag with a blue cross overall, with a gold crown in the centre. The flag is made of a wool and synthetic fibre bunting. It has a cotton hoist and is machine sewn. Part of the design is printed. A rope and two Inglefield clips are attached.

The origins of the Orient line went back to a shipbroking company formed by James Thompson in 1797. The company was operating a small fleet of ships by the early 1800s, sailing to Australia from the 1820s. In 1828 James Anderson joined Thomson and the company was renamed Anderson, Thomson and Company in 1863. In 1877 the Orient Steam Navigation Company was formed to run steamers on the Australian route (unlike P& O, the company carried emigrants).

From 1919 the Orient Line became part of the P & O group. Orient Line routes were extended across the Pacific to North America from 1954 and operating the company as a separate entity became less practical. The Orient Line was totally absorbed into P & O in 1960.