These are films that Quentin has mentioned in best-of lists, end of the year top films lists, QT Film Fests, podcasts, off-hand remarks in interviews, etc.
These have been sourced from many lists online, and made available here, in one spot, for your enjoyment.
Sources:
https://screenrant.com/quentin-tarantinos-favorite-movies-time-ranked/
https://mubi.com/lists/quentin-tarantinos-favorite-movies
https://imdb.com/list/ls043093231/
https://faroutmagazine.co.uk/quentin-tarantino-favourite-11-films-handwritten-list/
https://www.indiewire.com/gallery/quentin-tarantino-favorite-movies/
https://wiki.tarantino.info/index.php/Tarantino's_favorite_films
https://www.pulpfiction.com/quentin-tarantinos-top-20-films-1992-to-2009
Please comment on any that I may have missed.
A list of every film mentioned in the documentary In Search of Darkness.
UPDATED to include the films mentioned in the follow-up documentary In Search of Darkness: Part II.
List by hotsake
The Redsploitation genre concerns Native American characters almost always played by white actors, usually exacting their revenge on their white tormentors.
The top 50 best Spaghetti Westerns list has been compiled from 170 user-supplied top 20 lists at the spaghetti-western.net website.
Source: https://www.spaghetti-western.net/index.php/Essential_Top_20_Films
Liste des films présents dans le livre et le site Movieland www.movieland.io
Chronological list of 300 Spaghetti Westerns compiled from the following sources:
www.spaghetti-western.net/index.php/Top_Lists_and_Favorites
www.cinemadailies.com/the-best-spaghetti-western-movies-of-all-time
wikipedia.org/wiki/Spaghetti_Western
spaghetti western
A collection of 70s and 80s Italian movies
Westerns
by S Staael