Rubia agostinhoi is a climbing plant species of the Rubiaceae family endemic to the Azores[1] It was described by ecologists Pierre Dansereau and Pinto da Silva in 1977.

[2] Rubia agostinhoi has branched, glabrous, brushed or smooth stems, up to 3 metres (9.8 ft) long.

It has narrowly elliptical to linear or oblanceolate leathery, dark green leaves with very small, slightly revolted spines in the margins.

Leaves of the side shoots are shorter and smaller in length than those of the main stem.

It is commonly found in ravines, craters, natural forests and heather bushes.