I collected over 10 lists of the Best Books of 2021 from the Internet, newspapers and magazines and combined them into one meta-list.  Here are the results, every book on at least three of the original source lists, organized by rank (that is, with the books on the most lists at the top).

NOTE: These are not my personal opinions and I have not read all these books.

On 11 lists

Nonfiction
Empire of Pain: The Secret History of the Sackler Dynasty.  By Patrick Radden Keefe

On 8 lists 

Fiction
Harlem Shuffle. By Colson Whitehead
Detransition, Baby. By Torrey Peters
Great Circle. By Maggie Shipstead

Nonfiction
Crying in H Mart: A Memoir.  By Michelle Zauner
How the Word Is Passed: A Reckoning with the History of Slavery Across America.  By Clint Smith

On 7 lists

Nonfiction
A Little Devil in America: Notes in Praise of Black Performance.  By Hanif Abdurraqib

Fiction
Crossroads.  By Jonathan Franzen

 On 6 lists

Fiction
Hell of a Book. By Jason Mott
Cloud Cuckoo Land. By Anthony Doerr
No One Is Talking About This. By Patricia Lockwood
The Love Songs of W.E.B. Du Bois.  By Honorée Fanonne Jeffers
Klara and the Sun.  By Kazuo Ishiguro
The Prophets.  By Robert Jones Jr.
Afterparties: Stories. By Anthony Veasna So

On 5 lists

Fiction
The Lincoln Highway. By Amor Towles
Beautiful World, Where Are You. By Sally Rooney
Matrix. By Lauren Groff
My Monticello. By Jocelyn Nicole Johnson
The Committed. By Viet Thanh Nguyen
The Sentence.  By Louise Erdrich

On 4 lists

Fiction
Bewilderment. By Richard Powers
Intimacies. By Katie Kitamura
Libertie. By Kaitlyn Greenidge
One Last Stop.  By Casey McQuiston
How Beautiful We Were.  By Imbolo Mbue
Infinite Country. By Patricia Engel
The Other Black Girl. By Zakiya Dalila Harris
The Promise. By Damon Galgut

Nonfiction
Between Two Kingdoms: A Memoir of a Life Interrupted.  By Suleika Jaouad
The Code Breaker: Jennifer Doudna, Gene Editing, and the Future of the Human Race. By Walter Isaacson
Somebody’s Daughter: A Memoir.  By Ashley C. Ford
A Swim in a Pond in the Rain: In Which Four Russians Give a Master Class on Writing, Reading, and Life. By George Saunders
All That She Carried: The Journey of Ashley’s Sack, a Black Family Keepsake. By Tiya Miles

On 3 lists

Fiction
Razorblade Tears.  By S.A. Cosby
Velvet Was the Night.  By Silvia Moreno-Garcia
Oh William!  By Elizabeth Strout
Our Country Friends.  By Gary Shteyngart
The Chosen and the Beautiful. By Nghi Vo
The Sweetness of Water. By Nathan Harris
The Man Who Lived Underground. By Richard Wright
Milk Fed. By Melissa Broder
The Dangers of Smoking in Bed. By Mariana Enriquez. Translated by Megan McDowell
Appleseed.  By Matt Bell
Land of Big Numbers. By Te-Ping Chen
Something New Under the Sun. By Alexandra Kleeman
The Final Revival of Opal & Nev. By Dawnie Walton
Fake Accounts. By Lauren Oyler
Chronicles From the Land of the Happiest People on Earth.  By Wole Soyinka
Open Water. By Caleb Azumah Nelson
Light Perpetual.  By Francis Spufford
Wayward.  By Dana Spiotta
Damnation Spring.  By Ash Davidson

Nonfiction
On Juneteenth. By Annette Gordon-Reed
The Free World: Art and Thought in the Cold War.  By Louis Menand
Under a White Sky: The Nature of the Future. By Elizabeth Kolbert
The Copenhagen Trilogy: Childhood, Youth, Dependency. By Tove Ditlevsen Translated by Tiina Nunnally and Michael Favala Goldman.
All the Frequent Troubles of Our Days: The True Story of the American Woman at the Heart of the German Resistance to Hitler.  By Rebecca Donner
Invisible Child: Poverty, Survival and Hope in an American City.  By Andrea Elliott
Let Me Tell You What I Mean. By Joan Didion
Aftershocks: A Memoir. By Nadia Owusu