The brown trembler (Cinclocerthia ruficauda) is a species of bird in the family Mimidae, the mockingbirds and thrashers.

It is found on the islands of Saba, St. Kitts, Nevis, Montserrat, Guadeloupe, Dominica and St. Vincent in the Lesser Antilles of the Caribbean Sea.

It divides the brown trembler into four subspecies, the nominate C. r. ruficauda, C. r. pavida, C. r. tremula, and C. r. tenebrosa.

However, there is significant phylogenetic evidence that brown tremblers from Guadeloupe northwards may represent a separate species (C. tremula) from those on the other islands.

[3] Subspecies C. r. pavida of the brown trembler is the most widely distributed; it is found in the northern Lesser Antilles from Saba south to Montserrat.

[3] Tremblers derive their name from a typical behavior "in which the wings both are drooped and angled slightly away from the body...making very rapid vertical and lateral motions.

The brown trembler's principal song is "a series of variable loud phrases ranging in quality from 'rather harsh, others rich and warbled, still others high and squeaky'" It also has "subsongs" delivered less frequently.