Alchemist

Alchemists are those who practise alchemy, generally pertaining to natural elements like metals, as well as potions and rare ingredients, and are found throughout the world. The following are notable examples:

The Witcher

In The Witcher, most alchemists are also merchants and at least one is a witch. In fact, the only known alchemist in the game who is not also a merchant is Azar Javed.

Alchemist in Salt Square of the Trade Quarter marketplace
Alchemist at the Workshop in the Trade Quarter
Kalkstein
Abigail
Azar Javed
Master Jeremiah, listed as the author of the book Basics of Alchemy

The Witcher 2: Assassins of Kings

During the quests Little Shop of Dreams and The Scent of Incense, Geralt attempts to get the formula for some suspicious incense for a local alchemist, Vencel Pugg.

There is also an "Alchemist" skill in the alchemy tree in the Character panel.

The Witcher 3: Wild Hunt

Alchemists sell alchemical ingredients, and therefore make it easier for Geralt to find the ingredients he needs for alchemy. They are very similar to herbalists, but typically sell higher-quality ingredients and sometimes glyphs and runestones as well, functioning as a specialized type of merchant.

Kaer Morhen

Keira Metz (dependent)

Toussaint

Merchant at the Perfumery (shows as an alchemist, but is labeled as a merchant)
Wine Merchant at Chuchote Cave (initially shown as a vintner)
Wine Merchant at Dun Tynne Hillside (shows as a vintner, but is in fact an alchemist)

Notes

Several alchemist characters are encountered during Geralt's travels but they are unable to be interacted with as merchants.
- Berthold during Now or Never
- Albert Vegelbud during A Matter of Life and Death