Rotten Tomatoes: 21 Grams
- Includes movie stills, reviews, trailer, news, cast and crew.
- http://www.rottentomatoes.com/m/21_grams/

Mooviees!: 21 Grams
- Features photographs, trailers, reviews, cast overview and synopsis.
- http://www.mooviees.com/2379-21-grams/movie

Future Movies: 21 Grams
- Review by Nik Huggins.
- http://www.futuremovies.co.uk/review.asp?ID=170

1MovieSearch.com: 21 Grams
- Summary and review.
- http://www.1moviesearch.com/movies/21_grams.htm

HARO Online: 21 Grams
- Contains review and movie stills.
- http://www.haro-online.com/movies/21grams.html

Yahoo! Movies: 21 Grams
- Includes synopsis, trailers, production images, cast and credits.
- http://movies.yahoo.com/shop?d=hv&cf=info&id=1808467110

Internet Movie Database: 21 Grams
- Contains plot outline, image gallery, trailer and news articles.
- http://us.imdb.com/title/tt0315733/