The Witcher (PC) uses the Mason Serif Regular font in most of its packaging and publications. It is available as part of the fansite kit:

The Witcher Fansite Kit

Font mini-map

Font mason charmap

Morpheus font

Morpheus is another font which resembles the font used in The Witcher. This is a free font which can be downloaded from many sites on the internet. Here are examples of that font:

Lower case alphabet

Font lower case1 Font lower case2

Upper case alphabet

Font upper case1 Font upper case2