K:
- Ka'ahumanu, Queen of Hawaii
- Kajal Singh nee Sharma, Dowry Crime Victim
- Kara McCullough, Miss USA 2017 and Physical Scientist
- Karen Carpenter, Musician Whose Tragic Death Brought Eating Disorders to the National Attention
- Karen Horney, Psychoanalyst Famous for Questioning Freudian Views
- Kate Barnard, First Elected Female State Official for Oklahoma
- Kate Shelley, Railroad Heroine
- Kate Warne, The First Female Detective in United States History
- Katia Krafft, Volcanologist
- Katharina Schratt, Mistress of Franz Josef of Austria-Hungary
- Katharine Wright Haskell, Supportive Sister and So Much More
- Katharine Meyer Graham, Former CEO of The Washington Post
- Katherine Gilnagh Manning, Titanic Survivor
- Katherine Johnson, Physicist and Hidden Figure
- Katherine Parr, Henry VIII's sixth wife
- Kathleen Kennedy-Cavendish, the Rebel of the Kennedy Clan
- Kathleen Kenyon, archaeologist who led the Jericho Excavations
- Katharine Berry Richardson, Co-Created Children's Mercy Hospital in Kansas City, Missouri
- Kathrine Switzer, The First Woman to Run the Boston Marathon
- Kathryn Beaumont, Voice Actress and Disney Legend
- Kathryn Bigelow, The First Female Film Director to win a Best Director Academy Award
- Katrina Lake, CEO of Stitch Fix
- Kayla Mueller, Human Rights Activist Murdered by the Islamic State
- Kellyanne Conway, The First Woman to Run a Successful Presidential Campaign in United States History
- Kevyn Aucoin, before there were James, Jeffree, and Manny, there was Kevyn
- Khaemweset, the first Egyptologist
- Khentkaus III, Egyptian Queen whose tomb yielded new insights into her time period
- Khieu Ponnary, Pol Pot's First (And Later Ex) Wife
- Khoudia Diop, Model and Activist
- Khutulun, Mongol Warrior
- Khuwyt, One of the Earliest Known Female Musicians
- Kikisoblu, Daughter of Chief Si'ahl of the Duwamish and Suquamish Tribes
- Kittie Wilkins, The Horse Queen of Idaho
- Kiya, Wife of Pharaoh Akhenaten
- Kosem Sultan, One of the Most Powerful Women in the History of the Ottoman Empire
- Ko Yong-Hui, Kim Jong-Il's Wife and Kim Jong-Un's Mother
- Kubaba, The Only Woman Listed on the Sumerian King's List
- Kurmanjan Datka, United Kyrgyzstan as a Country
L:
- La Toya Jackson, Multi-talented Personality
- Laili Ali, Retired Professional Boxer
- Lakshimi Bai, The Queen of Jhansi, India
- Lana Peters, The Little Princess of the Kremlin
- Laura Alber, CEO of Williams-Sonoma
- Laura Bassi, The First Woman to Have a Fully-Fledged Scientific Career
- Laura Bullion, Outlaw of the Old West
- Laura Bush, Former First Lady during her husband George W Bush's Term
- Laura Eisenhuth, First Woman to Win an Election for Statewide Office in the United States
- Laura Ingalls Wilder, Author
- Lauren Holiday, Retired Olympic Soccer Player
- Laurie Hernandez, Olympic Gold Medalist in Gymnastics
- Laverne Cox, Actress and LGBT Advocate
- Lavinia Fisher, Possibly the First Female Serial Killer in the United States
- Lavinia Fontana, One of the Earliest Known Professional Female Artists
- Saint Lawrence, don't you touch his books
- Leigh Searl, founder of America's Career Force
- Lela Karagianni, Leader of a Resistance Group During World War II
- Leonor Villegas de Magnon, Nurse and Advocate During the Mexican Revolution
- Leonore Goldschmidt, Schoolteacher Who Continued to Teach Jewish Children in Hitler's Berlin
- Levicy Hatfield, The Matriarch of the Hatfield Clan
- Lewis W Washington, Genealogy Isn't Everything
- Leyla Mafi, Mentally Ill Girl Who was Flogged For Child Prostitution in Iran
- Libby Thompson, Madam, Prostitute, and Dance Hall Girl
- Lieserl Einstein, Albert and Mileva's Daughter Who Disappeared Into History
- Lillian Fishburne, The First Female African American Rear Admiral in the US Navy
- Lillian Gilbreth, Psychologist and Industrial Engineer
- Lillie Langtry, Scandalous Actress
- Lily Rose Lee, Kidnap Victim
- Lina Medina, Youngest Confirmed Human Mother in Medical History
- Linda B Buck, Physiologist
- Linda Hamilton, Actress
- Linda Lovelace, Porn Star Who Went on to Become a Born-Again Christian
- Linnda Caporael, Proposed Ergot Poisoning as a Cause for the Salem Witch Trials
- Lisa Ling, Journalist
- Lisa Marie Presley, Singer, Songwriter, and Elvis's Daughter
- Lise Meitner, Nuclear Physicist
- Liu Chuyu, Chinese Princess Remembered for Her Sexual Immorality
- Liza Minnelli, Actress and Singer
- Lizette Charbonneau, Sacagawea's Daughter
- Lizzie Arlington, The First Woman to Play on a Men's Professional Baseball Team
- Lizzie Borden, Took an Axe...
- Lola Greene Baldwin, The First Female Police Officer in the United States
- Lola Montez, She Toppled a Monarchy and Kept a Bear as a Pet, Need I say More?
- Lorena Hickok, Possibly Eleanor Roosevelt's Longtime Girlfriend
- Lorenzo Hubbell, trader and friend to the Navajo
- Loreta Janeta Velasquez, Confederate Soldier and Spy
- Loretta Lynn, Country Music Legend
- Lori Greiner, The Patent Queen
- Lorllys Ramos Acevedo, Former Head of the Venezuelan Aviation Accident Unit
- Lorna Luft, Actress and Singer
- Lottie Deno, Professional Gambler
- Louisa May Alcott, Author of Little Women
- Louise Siuwheem Polotkin, Apostle to Her People, The Coeur d'Alene
- Lozen, Chihenne Apache Warrior and Medicine Woman
- Sister Lucia Santos, One of the Fatima Prophecy Receivers
- Lucia Zarate, The World's Smallest Woman
- Lucie Aubrac, Schoolteacher and Member of the French Resistance
- Lucilla, Empress of Rome
- Lucille Ball, I Love Lucy too!
- Lucille Mulhall, The First Nationally Famous Cowgirl
- Lucrezia Borgia, she wasn't bad, but her family was
- Lucy Mercer Rutherfurd, FDR's Mistress
- Lulu White, Entrepreneur and Madam
- Lya Graf, Immortalized in a Photo Sitting on JP Morgan's Lap
- Lydia Litvyak, Soviet Air Force Pilot
- Lydia Nsekere, Member of the International Olympics Committee & The FIFA Executive Council
- Lyon Gardiner Tyler Jr, Died 175 Years After His Grandfather, the 10th US President, Left Office
- Lynne Chinn, Mosaic Artist and the Best Aunt Ever!
- Lynne Patton, Businesswoman and HUD Employee
- Lyudmila Pavlichenko, Deadliest Female Sniper in History