March for Our Lives (MFOL) is a student-led organization which leads demonstrations in support of gun control legislation. It took place in Washington, D.C., on March 24, 2018, with over 880 sibling events throughout the United States and around the world, and was planned by Never Again MSD in collaboration with the nonprofit organization Everytown for Gun Safety. The event followed the Marjory Stoneman Douglas High School shooting a month earlier, which was described by several media outlets as a possible tipping point for gun control legislation.

Never Again MSD is an American student-led political action committee for gun control that advocates for tighter regulations to prevent gun violence. The organization, also known by the Twitter hashtags #NeverAgain, and #EnoughIsEnough, was formed by a group of twenty students attending Marjory Stoneman Douglas High School (MSD) at the time of the deadly shooting in 2018, in which seventeen students and staff members were killed by the alleged gunman, Nikolas Cruz, who was a 19-year-old former student of the school and was armed with an AR-15 style semi-automatic rifle. The organization started on social media as a movement "for survivors of the Stoneman Douglas Shooting, by survivors of the Stoneman Douglas Shooting" using the hashtag #NeverAgain. A main goal of the group was to influence that year's United States mid-term elections, and they embarked on a multi-city bus tour to encourage young people to register to vote.