Sources

See a list I don't already have? Feel free to send the ranking/ballot/list to comicbookcanon@gmail.com and I'll work it into the ranking.

The True Japan (The 30 Best Manga of All Time)
Inside Japan Tours (BEST JAPANESE MANGA ACCORDING TO THE EXPERTS)
Speechify (25 best manga you need to read now)
Wionews (9 Greatest Manga All Time)
Happy Mag TV (25 of the best manga novels of all time)
Perapera (The 50 Best Manga of All Time)
Animeanime (Weekly Shonen Sunday Best Manga Ranking in History)
Bunshun (30 Greatest Sports Manga All Time)
Goo Rankings (Ranking of the best Shonen Jump In History)
ranking.goo (Ranking the Weekly Shonen Magazine Manga in magazine History)
Yahoo.jp (Greatest Manga All Time)
Omega Center (Los 15 mejores mangas de la historia)
ifema (Cuál es el mejor manga de la historia)
Manga Feel (The Most Influential Manga Series Of All Time)
Booklive.jp (What manga is a masterpiece?)
Chat.GPT (Greatest Manga of All Time)
Comic Critico (Top 50: Los mejores mangas de la historia)
Agency for Cultural Affairs (Top 50 Manga Series)
Natalie.mu (Best Manga of the Last 15 Years)
Numan. Tokyo (Young Jump's Top 10 Best Manga All Time)
School Library Journal (Top 10 Manga of 2023)
Watch Mojo (Top 10 Best Manga Series)
Japan Clothing (Greatest Manga of All Time)
The Top Tens (Best Manga of All Time)
Screen Rant (25 Best Manga You Can Read Right Now)
Geeks for Geeks (Top 10 Manga of All Time)
Book Worm Era (Top 10 Manga Of All Time: A Comprehensive List Of Must-Reads)
Otaku Lounge (Top manga of the 80’s, 90’s, 2000 and 2010)
Paste (10 Essential Manga That Should Belong in Every Comic Collection)
My Tour VN (Top 10 Best Manga Stories of All Time)
Rere.kp (Top 20 Manga of the last 10 Years)
Lifestyle Asia (The best manga comics of all time)
Otaku Art (24 Greatest Manga of All Time That You Must Read)
TV Asahi (Manga General Election)
Anime News Network (Manga Top 100 Best Rated (bayesian estimate)
Legit.ng (30 best manga of all time that you should check out right now)
JW WEb Magazaine (30 Best Manga of All Time)
The Anime Man (The OFFICIAL Top 100 Manga of All Time (According to the Internet))
Rehn Writer (THE 75 BEST MANGA OF ALL TIME ANYONE SHOULD READ)
Mundo Deportivo (Los mejores 11 manga de la historia)
Interac (The 31 Best Manga Series of All Time)
Comic Book Herald (Best Manga of the Decade)
Book Riot (The Most Influential Manga of All Time)
Comic Vine (Best Manga Series 2010's)
Anime Collective (55 Best Manga All Time)
Anilist.co (Top 100 Manga)
Book Scrolling (The Best Japanese Manga Of All-Time)
Live About (Top 20 Manga Must-Reads)
Good Reads (Best Manga of All Time)
Good Reads (Best Manga Book Ever)
The Guardian (Manga comics: where to start)
My Anime List (Top Manga)
Ranker (The 90+ Greatest Manga Of All Time, Ranked)
Reedsy (The 75 Best Manga of All Time)
Japan Geeks (40 Best Manga of All Time)
Japan Avenue (Top 30 best Japanese Manga)
Anime Collective (Best Horror Manga)
CBR (20 Best Comedy Manga, Ranked)
Ranker (The 20 Best New Manga You Should Be Reading In 2022)
Books & Bao (23 Must-Read Modern Shonen Manga)
Cultured Vultures (15 Best Horror Manga You Should Read)
Take Lessons (5 Must-Read Japanese Manga Books)
BGM (100 Manga Art)
Kyuhoshi (10 Best Japanese Classic Manga Series)
Bagumi.tv (80 Manga Masterpieces That Influenced the History of Manga)
Kaipon (Top 100 Manga Titles)
Anime Collective (11 Must-Read Manga if You Love Berserk)
Mottainaihonpo (71 Must-Read Manga)
Nerdist (An Introduction to Manga)
Buzzfeed (Essential Manga Series Everyone Should Read)
Japan Dreaming (25 Best Manga Series Ever)
FluentU (5 Timeless Japanese Manga Comic Books You’ve Got to Know)
Hatelabo (20 Greatest Shonen Jump Manga)
BookLive (Most Recommended Manga)
Osusume (Ragai Eisu's Curated List)
Ebook Japan (100 Greatest Manga in History)
Booklive (100 Best Manga of Heisei Era)
Anime Collective (28 Best Sci-Fi Manga You Need To Read in 2024)
CBR (Best Romance Manga of the Decade)
Anime Collective (26 Best Seinen Manga You Need to Read)
My Anime List (Most Important and Influential Manga)
Anime Collective (Best Manga of 2023: The Must-Read Releases)
Anime Collective (14 Best Supernatural Manga You Need to Read in 2024)
CBR (The Best Oneshot Manga & Omnibuses You Can Read Right Now)
Augustman (The Best Manga Comics Everyone Should Read)
I Am Bored (20 Best Manga from the Last Decade)
CBR (The Best Seinen Manga for Comic Book & Graphic Novel Fans to Read)
Book Riot (8 Dark Academia Manga and Manhwa)
Book Riot (10 of the Best Romcom Manga I Fell In Love With)
CBR (50 Best Manga Of All Time, Ranked)
CBR (The Best Apocalyptic Manhwa to Read Other Than Solo Leveling)
VICE (Top Manga Comics of All Time)
More Onions (Top Ten Manga of the Decade)
Rankings.net (Best Manga)
Screen Rant (15 Best Manga of All Time, Ranked)
Screen Rant (12 Best Post-Apocalyptic Manga)
Ani Gamers (The Best Manga of the 2010s)
Fandom Spot (Top 20 Best Manga Released In The 2010s)
Book Riot (50 Best Manga You Must Read Right Now)
Peachy (Young Jump's Best Comics Ranking)
Book Riot (11 of the Best Shonen Manga to Read in 2023)
Book Riot (Laughing Along With 10 of the Best Comedy Manga And Manhwa)
Book Riot (A Beginner’s Guide to Seinen Manga)
Jiaodong.net (est Manga Top 100 of All Time by Chinese Critics)
Geeks for Geeks (Top 10 Manhwa of All Time)
Anime Planet (Top 50 Cultivation manga/manhua/manhwa/webtoon)
CBR (10 Must-Read Manhua For Fans Of Manga)
Sports Keeda (7 best manhua that you need to read)
Cultura (Top 10 des meilleurs seinen)
Cultura (Top 10 des meilleurs mangas)
My Anime List (Top Manhua)
CBR (20 Best Ongoing Shonen Manga Perfect For New Readers)
Screen Rant (10 Best Shonen Jump Manga Of All Time, Ranked)
The Gamer (15 Must-Read Manga Of All Time)
IGN (The Best Manga for Beginners to Read First)
Espectro Emocional (Top 15 Mejores Mangas de Romance Cortos para leer al instante)
Screen Rant (15 Best Seinen Manga, Ranked)
Book Riot (The Top 10 Summer Manga To Pack In Your Beach Bag)
Book Riot (10 of the Best Cozy Manga That Feel Like Warm Hugs)
Book Riot (12 of the Best Shōjo Manga)
Book Riot (An Introduction to Josei Manga)
Bedetheque (Les indispensables - Manga)
Mottoain Aihonpo (50 Greatest Historical Manga)
Note.com (I read more than 1,000 comics I choose all-time best 100 Manga)
Sakidori (100 Greatest Manga)
r/manga (Top Manga)