Velarization is a secondary articulation of consonants by which the back of the tongue is raised toward the velum during the articulation of the consonant.

The dark l of many accents of English is an example of a velarized consonant.

In many languages, including Irish and Russian, velarized consonants contrast phonemically with palatalized consonants. The palatalized/velarized contrast is often known by other names, especially in language pedagogy: in Irish language teaching, the terms slender (for palatalized) and broad (for velarized) are often used, while in Russian language teaching, the terms soft (for palatalized) and hard (for velarized) are usual. The terms light (for palatalized) and dark (for velarized) are also widespread.

In the International Phonetic Alphabet, velarization can be indicated by one of two methods:

1. printing a tilde or swung dash through the letter standing for the velarized consonant, as in (the velarized equivalent of [l], or
2. printing the symbol [ˠ] (a superscript gamma) after the letter standing for the velarized consonant, as in [tˠ] (the velarized equivalent of [t].