Swynnerton's robin (Swynnertonia swynnertoni) is a species of passerine bird belonging to the family Muscicapidae. It is monotypic within the genus Swynnertonia. The common and Latin names commemorate the entomologist Charles Swynnerton.

Swynnerton's robin was first formally described as Erythracus swynnertoni in 1906 by the English geologist and ornithologist George Ernest Shelley. The type specimen was collected in June 1905 in the Chirinda Forest in eastern Rhodesia, modern Zimbabwe. It was thought to be closely related to the white-starred robin (Pogonocichla stellata) so was placed by some authorities in the same genus, Pogonocichla. However, in 1922 Austin Roberts proposed that this taxon was distinctive enough from both the European robin (Erithacus rubecula) and the white-starred robin that it should be classified within its own monospecific genus, Swynnertonia. The genus Swynnertonia is classified within the subfamily Erithacinae of the large passerine family Muscicapidae, the chats and Old World flycatchers. However, it has been argued that the name of this clade should be Cossyphinae, as this was proposed by Vigors in 1825 and so predates Gray's 1846 Erithacinae.

Swynnerton's robin has two parapatric subspecies:

A third subspecies S. s. umbriata was described from Mount Gorongosa in 1974 by Phillip Clancey but this is now regarded as a synonym of the nominate subspecies.

Swynnerton's robin honours the British entomologist Charles Swynnerton in its common name, genus name and specific name. Swynnerton discovered the bird before Shelley formally described it. Roberts used the name Melsetter robin for this species, Melsetter being the colonial era name for Chimanimani. The subspecies S. s. rodgersi has a subspecific epithet which honours Dr W. A. Rodgers who drew Jensen and Stuart's attention to the biological importance of the type locality of this form, the Mwanihana Forest.

Swynnerton's robin is superficially similar to the larger White-starred robin, but has a white crescent on the upper breast, which is bordered below with a black line, and its grey tail lacks yellow windows. Its sexually dimorphic plumage is unusual among African robins. The female has duller plumage and an olive wash over the crown and face. Juveniles are spotted buffy yellow on the head and upper parts, while the chest crescent is pale greyish brown. This species has a length of 13 to 14 cm (5.1 to 5.5 in).

Swynnerton's robin has a song which has been described as a 3 note whistle, rendered as "zit zitt slurr" or "tsee-tuu-tuu". The third note may be lower in pitch than the preceding 2. The alarm call is a quiet chattering "trrrrrt".

Swynnerton's robin is a localised distribution in eastern and southern Africa. In Tanzania there are two populations, one in the Udzungwa Mountains and another, smaller population, in the East Usambara Mountains. The Tanzanian populations are the subspecies S. s. rodgersi. There are two populations in Mozambique, named as S. s, umbratica by the International Union for Conservation of Nature, on e on Mount Gorongosa and the other on Mount Mabu in the north of the country, this population was discovered in 2008. In Zimbabwe this species is known to occur at the Chirinda Forest Botanical Reserve and a few small forested areas along the border with Mozambique.