Tirumala formosa, the forest monarch or beautiful tiger, is a butterfly of the family Nymphalidae.

The uppersides of the hindwings are black, with a series of small white spots and a large hyaline basal area.

This species is mimicked (Batesian mimicry) by the Kenyan forms of the regal swallowtail (Papilio rex).

[1] Tirumala formosa can be found in tropical Africa (Cameroon, Ethiopia, Kenya and Tanzania).

[1] This species lives in semimontane forests, at an elevation of about 1,500–2,300 metres (4,900–7,500 ft) above sea level.