Kathryn Jean Lopez, (born March 22, 1976) a native of Manhattan, is an American conservative columnist who is nationally syndicated by the United Feature Syndicate/Newspaper Enterprise Association. She is also the editor of National Review Online. Her nickname on National Review Online's group blog "The Corner", is "K-Lo", a wordplay based on "J-Lo", the popular nickname for Jennifer Lopez.

Lopez grew up in the Chelsea section of lower Manhattan, and graduated from The Catholic University of America in Washington, D.C., where she studied philosophy and politics. Before joining National Review in New York, she worked at the Heritage Foundation on Capitol Hill. Besides National Review and NRO, her work has appeared in The Wall Street Journal, The Washington Times, The Women's Quarterly, The National Catholic Register, Our Sunday Visitor, American Outlook, New York Press, and The Human Life Review, among other publications.

She writes often on bioethics, religion, feminism, abortion, education, politics. Of NRO's writers, she tends to be the greatest proponent of "culture of life" issues from a Catholic perspective, and argues for adherence to orthodox Catholic practices, such as Natural Family Planning for birth control. She also advocates conservative leadership within the Church, and was a supporter of the election of Pope Benedict XVI.