The flag of Saint Helena, Ascension and Tristan da Cunha consists of a blue field with the Union Jack in the upper hoist-side quadrant and a shield centered on the outer half of the flag; the shield features a yellow ship above two crossed yellow axes on a green mound. The blue represents the ocean around the islands, the Union Jack reflects the islands' historical links with Britain, the ship symbolizes the vessels that carried settlers to the islands, and the axes represent tools used by the islanders in construction and industry. The flag has an aspect ratio of 1:2, and the shield measures approximately 5/8ths the height of the flag. The colors used in the flag are:

• Blue: Pantone 280 C / RGB 0 35 102
• Yellow: Pantone 123 C / RGB 255 221 0
• Green: Pantone 356 C / RGB 0 122 61