M:
- Madam CJ Walker, the first female self-made millionaire in the US
- Madeleine Astor Dick, RMS Titanic Survivor
- Madeline Stuart, One of the First Professional Models to be Born With Down Syndrome
- Madonna Ciccone, aka Madonna
- Mae Capone, Al's Widow
- Mae C Jemison, the first African American woman to go to space
- Mae West, One of Hollywood's First "Sex Symbols"
- Magda Gabor, Actress
- Maggie Lena Walker, The First Woman to Charter a United States Bank
- Maggie Smith, Actress
- Magistra Hersend, One of Louis IX's Surgeons During the Seventh Crusade
- Mai Bhago, Sikh Warrior Saint (Khalsa)
- Maila Nurmi, Actress Who Brought Vampira to Life
- Malala Yousafzai, Education Activist
- La Malinche, Linguist Who Helped Bring Down the Aztec Empire
- Mamie Fossett, Deputy Marshal in the Indian Territory
- Mamie Phipps Clark, Psychologist Who Focused on The Effects of Segregation in Small Children
- Mandukhai Khatun, Mongolian Empress
- Manfreda, Papess of a Feminized Christian Sect
- Manon Rheaume, The First Woman to Work as a Goalie on a Professional Hockey Team
- Manuela Saenz, Revolutionary Leader & Suffragette
- Margaret Abbott, The First US Woman to Win an Olympic Event
- Margaret of Anjou, Queen of England and Pivotal Figure in the Wars of the Roses
- Margaret Brent, The First Woman in the American Colonies to Appear Before a Court of Common Law
- Margaret Bulkley, Successful Army Surgeon
- Margaret Corbin, The First American Woman to be Given a Military Pension
- Margaret Floy Washburn, First Woman to Earn a PhD in Psychology
- Margaret Hamilton, Retired NASA Computer Code Writer
- Margaret Harwood, First Female Director of the Maria Mitchell Observatory
- Margaret Heffernan Borland, One of the First Female Cattle Drivers in the United States
- Margaret Isabella Breen McMahon, Last Survivor of the Donner Party
- Margaret Keane, Artist Known for her "Big Eyes" Paintings
- Margaret of Norway, Scotland's First Queen Regnant
- Margaret Pole, Once a Traitor Now a Martyr
- Margaret Rudkin, Founder of Pepperidge Farm
- Margaret Thatcher, the First Female Prime Minister of the United Kingdom
- Margaret Tobin Brown, otherwise known as the Unsinkable Molly/Maggie Brown
- Margaretha MacLeod, but you know her as Mata Hari
- Margot Wolk, The Last Surviving Food Tester for Hitler
- Maria Bartola, The First Historian of Mexico
- Maria Gaetana Agnesi, Pioneering Calculus Mathematician
- Maria Goeppert Mayer, Theoretical Physicist
- Maria Halpin Hunt, Her Life was Destroyed by a US President
- Senora Dona Maria Luz Corral de Villa, Pancho Villa's Wife
- Maria Milagro de Hoyos, Sadly, she's known for what happened to her corpse after her death
- Maria Mitchell, the First Female Astronomer in the United States
- Maria Montessori, Creator of the Montessori Learning Technique
- Maria Nikolaevna Romanova, Grand Duchess of Russia
- Maria Rasputin, Lion Tamer and Circus Performer
- Maria Sibylla Merian, Entomologist and Scientific Illustrator
- Marianne Cope, Catholic Saint Who Helped Those Stricken With Hansen's Disease
- Marie Antoinette, she did not say "Let them Eat Cake!"
- Marie Daly, the First African American Woman to Receive a PhD in Chemistry
- Marie Dionne, One Fifth of the First Set of Quintuplets Known to Survive Infancy
- Marie Skłodowska Curie, you know her name
- Marie Walewska, Mistress of Napoleon
- Marie Claude Beaumont, Le Mans race car driver
- Marie-Claude Vaillaint-Courturier, French Politician and Resistance Fighter
- Marie Dorion, The Second Woman to Trek Across the Western United States After Sacagawea
- Marie-Louise O'Murphy, Youngest European Court Mistress
- Marie Marvingt, Pioneering Aviatrix and Athlete
- Marie Stopes, Eugenicist and Birth Control Pioneer
- Marie Equi, Progressive Political Activist and Birth Control Provider
- Marilu Henner, Actress
- Marilyn Monroe, Actress
- Marillyn Hewson, CEO of Lockheed Martin
- Marina the Monk, Catholic Saint
- Marina Raskova, Soviet Pilot and Navigator During World War II
- Marina Yurlova, Teenage Cossack during World War I
- Mariska Hargitay, actress and activist
- Marissa Mayer, Google's 20th Employee--ever
- Mariya Oktyabrskaya, Soviet Tank Driver During World War II
- Marjorie Collyer Dutton, RMS Titanic Survivor
- Marjory Stoneman Douglas, Conservationist
- Mark Hogancamp, the real man behind Welcome to Marwin
- Marla Maples, Actress and Television Personality
- Marsha P Johnson, LGBT+ Activist
- Martha Borthwick Cheney, Translator and Mistress of Frank Lloyd Wright
- Martha Corey, Accused of being a Witch at Salem
- Martha Washington, The first First Lady of the United States
- Martin Couney, neonatal technician who never received any medical training
- Martin Sklar, Disney's International Ambassador for Imagineering
- Martin Van Buren Bates, the Kentucky River Giant
- Martine Bertereau, Mining Engineer and Geologist
- Martha Matilda Harper, Created the First Formal Franchise in the US
- Mary Agnes Chase, Botanist and Social Activist
- Mary Anderson, Windshield Wiper Inventor
- Mary Ann Conklin, Manager of Seattle's First Known Brothel
- Mary Anne Arnold, cross dressing sailor
- Mary Anne Talbot, soldier who fought in the French Revolution
- Mary Anning, the mother of paleontology
- Mary Bankes, Defended Her Castle Home During the English Civil War
- Mary T Barra, CEO of General Motors
- Mary Barrett Dyer, One of America's First Religious Martyrs
- Mary Boleyn, Mistress of Henry VIII
- Mary Bradford Johns, Heroine of the Battle of Nashville
- Mary Brooks, Director of the United States Mint from 1969 to 1977
- Mary Colter, Interior Designer and Architect
- Mary Curzon, Vicereine of India
- Mary Donoho, The First Lady of the Santa Fe Trail
- Mary the Elephant, Circus Performer
- Mary Ellen Pleasant, Entrepreneur and Abolitionist
- Mary Fields, aka Stagecoach Mary
- Mary I, the real Bloody Mary
- Mary Frith, aka Moll Cutpurse
- Mary Galloway, Union Soldier During the War Between the States
- Mary Golda Ross, The First Female Native American Engineer
- Mary Higby Schweitzer, Paleontologist With an Astonishing Discovery
- Mary Jackson, The First African American Female Engineer at NASA
- Mary Jo Kopechne, Teacher and Campaign Worker
- Mary K Horony-Cummings, Also Known As Big Nose Kate
- Mary Katharine Goddard, The First Female Postmaster General in US History
- Mary Lou Gulley, The Mystery Castle Owner
- Mary Leakey, Paleoanthropologist
- Mary Ludwig Hays McCauley, one of the inspirations for Molly Pitcher
- Mary Magdalene, Jesus's disciple
- Mary Mallon, "Typhoid Mary"
- Mary McLeod Bethune, Civil Rights Activist
- Mary Musgrove, Interpreter and Trading Post Owner
- Mary Page Handy, Arizona Pioneer Whose Life Reads Like a Greek Tragedy
- Mary Pearcey, Murderess
- Mary Peck Butterworth, One of the Most Famous Counterfeiters of All Time
- Mary Phagan, her murder made race relations in the south worse than ever before
- Mary Pinchot Meyer, Painter whose Murder has Never Been Solved
- Mary Read, pirate
- Mary Rogers, New York's Cigar Girl turned murder victim
- Mary Rowlandson, Early Colonial Author who Wrote About Her Kidnapping Experience
- Mary Seacole, Nurse During the Crimean War
- Mary Somerville, One of the First Female Honorary Members of the Royal Astronomical Society
- Mary Stuart, aka Mary Queen of Scots
- Mary Surratt, the first woman to be executed by the United States Federal Government
- Mary Todd Lincoln, First Lady during her husband Abraham Lincoln's term
- Mary Toft, Was Able to Convince the General Public She was Giving Birth to Rabbits
- Mary Vincent, Kidnap Victim Who Had Her Forearms Cut Off Before Being Left For Dead
- Mary von Vetsera, half of one of the most famous cases of murder/suicide of all time
- Mary Von Waldersee, Philanthropist & Possible Mistress of Wilhelm II
- Mary Whiton Calkins, First Woman Elected President of the American Psychological Association
- Mary Wilde, Oscar Wilde's Half-Sister
- Mary Wollstonecraft Godwin, Feminist Author
- Mary Wollstonecraft Shelley, author of Frankenstein
- Maryam Mirzakhani, Pioneering Mathematician
- Maxine Dale, World War II Veteran, Machinist, and Mother
- Empress Matilda, Holy Roman Empress and Queen of England
- Matt Carriker, in his words, "Welcome to the Demolitia"
- Matt Shepard, his horrible murder sparked national attention, eventually culminating into Federal Laws to protect against hate crimes
- Maud Wagner, First Known Female Tattoo Artist in the United States
- Maude Frazier, First Female Lieutenant Governor of Nevada
- Maude Steane, One of Eight Canadian Women Confirmed Killed in Action During World War II
- Maurice Hilleman, anti-vaxxers hate him!
- Maya Angelou, Poet and Actress
- Mayar Mohamed Moussa, Died During a Botched FGM Operation
- Maybelle Carter, Musician and Matriarch of Country Music
- May-Britt Moser, Psychologist and Neuroscientist
- Dr. Mayim Bialik, PhD, Actress and Neuroscientist
- McKenna Dahl, Paralympian Rifle Shooter
- Meg Whitman, former CEO of Ebay
- Megan Leavey, Former Marine Corps Corporal in a K-9 Unit
- Meira Kumar, India's First Female Speaker of the Lok Sabha
- Mekatilili wa Menza, Revolted Against the Colonial British
- Meketaten, Princess of Ancient Egypt
- Melania Trump, Be Best
- Melanie Gaydos, Model with Ectodermal Dysplasia
- Melba Roy Mouton, One of NASA's Hidden Figures
- Melissa Lora, Former President of Taco Bell International
- Mercy Brown, Victim of the Vampire Hysteria
- Mercy Otis Warren, Ardent Patriot and Author in the Earliest Years in the United States
- Meredith Kercher, remember her as a happy student, not for what happened to her
- Meresankh III, Egyptian Royal Woman
- Merit Ptah, the first known female doctor--and scientist
- Meritaten, daughter of Pharaoh Akhenaten and Nefertiti
- Merneith, One of the Earliest Known Queens in History
- Micaela Almonester, Real Estate Developer with In-Laws From Hell
- Michele Roberts, Executive Director of the National Basketball Players Association
- Miep Gies, she saved Anne Frank's diary
- Mike Rowe, Oh come on, you know who he is!
- Mikhail Romanov, the reluctant Tsar
- Mildred Fish-Harnack, The Only American Civilian Woman Executed by the Nazis
- Capt. Mildred H McAfee Horton, Director of the WAVES During World War II
- Milunka Savić, Probably the Most Decorated Female Soldier in the History of Ever
- Mileva Marić, she was so much more than Albert Einstein's wife
- Millicent Fawcett, Suffragette
- Millvina Dean, the Last RMS Titanic Survivor to Pass Away
- Mimi Haist, Queen Mimi
- Mindy Grossman, CEO of WW (Weight Watchers)
- Minerva Mirabal, One of Las Mariposas
- Minnie Vautrin, Missionary Forever Haunted By What She Witnessed During the Rape of Nanking
- Mirhimah Sultan, Most Powerful Ottoman Princess in the History of the Empire
- Misty Copeland, The First African American Woman to be Hired as a Principal Dancer for a Major Ballet Company
- Misty May-Treanor, Retired Professional Volleyball Player
- Moana Pozzi, Adult Film Actress and Politician
- Moll King, One of History's Most Notorious Pickpockets (or was she?)
- Monica Lewinsky, Activist and Anti-Cyber-bullying Advocate
- Monica Mitro, Executive Producer of the Victoria's Secret Fashion Show
- Motke Zeidel, the last survivor of the Burning Brigade
- Moving Robe Woman, Warrior who Fought at the Battle of Little Bighorn
- Mum Zi, Possibly the World's Youngest Grandmother, Becoming One at the Age of 17
- Mumtaz Mahal, the Taj Mahal is her mausoleum
- Murasaki Shikibu, The First Known Author of a Novel
- Myra Bradwell, The First Licensed Female Lawyer in Illinois