Buff

Taunt

If a Champion is under a Taunt buff, enemies can only target that Champion. If there are several Champions under a Taunt buff on the same team, enemies can target any of the Taunting Champions.
When using an AoE attack, only the Champion under the Taunt buff can be targeted, but their allies will still take damage from the AoE attack as normal.
The Provoke debuff has priority over the Taunt buff, meaning a Provoked Champion will still only target the Champion who placed the Provoke debuff on them, rather anyone under a Taunt buff.
In addition, if there is only one Champion under a Taunt buff on a team, it will supersede any other buffs that affect targeting (like Veil and Perfect Veil), meaning a Champion under both Taunt and Veil buffs will be targeted.
However, if there are multiple Champions under Taunt buffs on a team, buffs that affect targeting (like Veil and Perfect Veil) will then take effect to decide who will be targeted. For example, in a situation where two Champions are under Taunt buffs, but one of them is also under a Veil buff, the Champion under only Taunt will be targeted, whereas the Champion under Taunt and Veil will not.
The Taunt buff cannot be spread, and its duration cannot be increased. It can be stolen, removed, and its duration can be decreased.
What the game's own status effects screen says

In the game data this effect appears as Taunt.

Champions that apply it

20 champions have a skill that applies Taunt, according to the effect lines in the game data. This lists who applies it, not how reliably: chance, duration and resistance are on each champion's page.

The description is the game's own text. It has not been tested in battle here, and the game's wording can be loose (for example about numbers that differ between versions of an effect). See Data quality for what has and has not been checked. Found a mistake? Use "Report a problem" at the bottom of the page.