A bog is a mire that accumulates peat, a deposit of dead plant material—often mosses, and in a majority of cases, sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, quagmire, and muskeg; alkaline mires are called fens. They are frequently covered in ericaceous shrubs rooted in the sphagnum moss and peat. The gradual accumulation of decayed plant material in a bog functions as a carbon sink.

Bog is a wetland of mosses or lichens over waterlogged peat.

A Bunch of Guys (BOGs), or Group of Guys (GOGs) are terms used by counter-terrorism officials to refer to small, self-organizing terrorist cells. BOGs typically have little to no contact with global terrorist groups like al Qaeda, so they independently plan and execute their own operations with no outside guidance. BOGs are usually anonymous groups of disaffected amateurs who "self-radicalize".