True or sylviid warblers, remaining in family Sylviidae or moved into Timaliidae

New World warblers, family Parulidae

These are closely related to the titmice and chickadees

Cisticoline warblers, family Cisticolidae

Malagasy warblers, a newly assembled family ("Bernieridae")

Tit-warblers or flycatcher-tits, family Stenostiridae

There are a number of passerine birds, order Passeriformes, which are called warblers. They are not particularly closely related, but share some characteristics, such as being fairly small, active and insectivorous. They are mostly brownish or dull greenish in color, of small size, easier seen than heard, and harder to determine to species. To Old World birders, "warblers" are the the archetypal "LBJ" ("little brown job").

Leaf-warblers, now in family Phylloscopidae

Typical bush-warblers, now in family Cettiidae

Grass warblers and megalurid bush-warblers, now in family Megaluridae

Marsh- and tree warblers, now in family Acrocephalidae

These are somewhat closer related to each other than the rest. They belong to a superfamily also containing Old World babblers, bulbuls, etc.

Olive Warbler, monotypic family Peucedramidae

The two families of American "warblers" are part of another superfamily, which unites them with sparrows, buntings, finches, etc

Australian warblers, subfamily Acanthizinae of family Pardalotidae

These are the most distinct group of "warblers". They are not closely related at all to the others, but rather to the honeyeaters and fairy-wrens.