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The barred lambda (Ƛ ƛ) (U+A7DC Ƛ LATIN CAPITAL LETTER LAMBDA WITH STROKE, U+019B ƛ LATIN SMALL LETTER LAMBDA WITH STROKE), is a modified letter of the Greek alphabet, commonly encountered in North American linguistics. It is used by the Salishan and Wakashan languages in Canada.^[1] It is also used in Americanist phonetic notation, where it is also known as running man,^[2] to transcribe a voiceless alveolar lateral affricate [t͡ɬ]. In physics, it represents the reduced Compton wavelength, i.e. the Compton wavelength λ divided by 2π.

Cased forms of the barred lambda. The capital was assigned to Unicode in 2024.

It was first used in a phonetics context in American Anthropologist in 1934:

λ for [dl] has been used in Eskimo by Jenness … ƛ for [tł] is an innovation formed from λ as ł from l.^[3]

It is also used for the affricate [t͡ɬ] in transcribing the Sahaptin language, e.g., iƛúpna ‘he jumped’, and it is commonly used for the same purpose in several languages of the Caucasus, such as Hinuq.^[4] In addition, its counterpart with a combining comma above right (U+0315), ƛ̓ [fr], is used for many of the Salish languages, such as Klallam, for an alveolar lateral ejective affricate [t͡ɬʼ].