Tickell's blue flycatcher (Cyornis tickelliae) is a small passerine bird in the flycatcher family. This is an insectivorous species which breeds in tropical Asia, from the Indian Subcontinent eastwards to Bangladesh and western Myanmar. The Indochinese blue flycatcher was formerly considered conspecific. They are blue on the upperparts and the throat and breast are rufous. They are found in dense scrub to forest habitats. The name commemorates the wife of the British ornithologist Samuel Tickell who collected in India and Burma. Tickell's blue flycatcher is about 11–12 cm long. It sits upright and forages mainly in the overgrowth. The male's upper parts are bright blue, its throat and breast are red, and the rest of the underparts are white. The female is duller blue with a brighter blue brow, shoulder, rump, and tail. It hybridizes with the pale-chinned blue flycatcher (Cyornis poliogenys) in the Eastern Ghats of India and these hybrids have sometimes been treated as a subspecies vernayi. The juvenile is streaked and has a spotted mantle, scaly brown upperparts, head and breast, with just the wings and tail being blue. They have sometimes been known to feed even after dusk. Apart from flying insects they may occasionally pick up crawling insects. The species shows regional variations in plumage and size and several of these populations have been designated with subspecies names. The nominate form is found in India, Nepal and Myanmar. The Sri Lankan population is separated as jerdoni (or nesea/mesaea said to be darker) In the past this species has been considered as a subspecies of the blue-throated blue flycatcher (Cyornis rubeculoides) which resembles this but has a blue throat.