The Bull's Eye (Portuguese Olho-de-boi) postage stamps were the first stamps issued by Brazil, on 1 August 1843, having face values of 30, 60, and 90 réis.

Brazil was the second country in the world, after the United Kingdom, to issue postage stamps valid within the entire country (as opposed to a local issue).

[1] Like the United Kingdoms's first stamps, the design does not include the country name.

The unusual name derives from the ornamental value figures inside the oval settings, and the arrangement of the stamps in the sheet, which permitted se-tenant pairs that looked like a pair of bull's eyes.

The most important recent Bull's Eyes collection to be sold was that of Hugo Goeggel in 2013.