
This is a list of mass shootings in the United States that have occurred in 2019. Mass shootings are incidents involving multiple victims of firearm-related violence. The precise inclusion criteria are disputed, and there is no broadly accepted definition.

On August 4, 2019, 24-year-old Connor Betts shot and killed nine people and injured 17 others near the entrance of the Ned Peppers Bar in the Oregon District of Dayton, Ohio. Betts was fatally shot by responding police officers 32 seconds after the first shots were fired. A total of 27 people were taken to area hospitals.

On August 3, 2019, a mass shooting occurred at a Walmart store in El Paso, Texas, United States. A gunman shot and killed 23 people and injured 23 others. The Federal Bureau of Investigation is investigating the shooting as an act of domestic terrorism and a hate crime. The shooting has been described as the deadliest attack on Latinos in modern American history.

On November 17, 2019, a mass shooting occurred at a Fresno, California football watch party with 35 to 40 people present, including several children. Four people were killed and six were injured. It was the third mass shooting in California in less than a week, the others being the Saugus High School shooting that killed three and injured another three in Santa Clarita, and a family murder–suicide in San Diego that killed five and injured one.

On July 28, 2019, a mass shooting occurred at the Gilroy Garlic Festival in Gilroy, California. The gunman killed three people and wounded 17 others before committing suicide after a shootout with responding police officers.

On December 10, 2019, a shooting was perpetrated at a kosher grocery store located in the Greenville section of Jersey City, New Jersey, in the United States. Five people were killed at the store, including the two assailants. Additionally, the assailants wounded one customer and two police officers. A Jersey City Police Department detective was shot and killed by the assailants at a nearby cemetery just before the grocery store attack. New Jersey Attorney General Gurbir Grewal stated that evidence indicated the attacks were acts of hate and domestic terrorism fueled both by anti-Semitism and anti-law enforcement beliefs.

On August 31, 2019, a spree shooting occurred in the West Texas cities of Midland and Odessa when a gunman shot multiple people from a vehicle. Eight people were killed, including the perpetrator, and twenty-five people were injured, including three police officers. It was the third major mass killing to take place in the United States in August 2019, along with the El Paso Walmart shooting and the Dayton shooting.

On the morning of December 6, 2019, a terrorist attack occurred at Naval Air Station Pensacola in Pensacola, Florida. The assailant killed three men and injured eight others. The shooter was killed by Escambia County sheriff deputies after they arrived at the scene. He was identified as Mohammed Saeed Alshamrani, an aviation student from Saudi Arabia.

The Poway synagogue shooting occurred on April 27, 2019, when a gunman armed with an AR-15 style rifle fired shots inside the Chabad of Poway synagogue in Poway, California, United States, a city approximately 20 miles (32 km) north of San Diego. The attack took place on the last day of the Jewish Passover holiday, which fell on a Shabbat. One woman was killed and three other people were injured, including the synagogue's rabbi. After fleeing the scene, the gunman, John Timothy Earnest, phoned 9-1-1 and reported the shooting. He was apprehended in his car approximately two miles (3.2 km) from the synagogue by a San Diego police officer.

On October 14, 2019, six people were killed during a shootout between drug gangs in a gun battle at the Ernesto Ramos Antonini de Río Piedras residential apartments in the Río Piedras area of San Juan, Puerto Rico.

On November 14, 2019, at Saugus High School in Santa Clarita, California, United States, a mass shooting occurred when a student with a pistol, identified as 16-year-old Nathaniel Berhow, shot five schoolmates, killing two, before killing himself.

On May 7, 2019, a school shooting occurred at STEM School Highlands Ranch, a charter school located in Douglas County, Colorado, United States, in the Denver suburb of Highlands Ranch. One student was killed and eight others were injured. Two suspects, both students at the school, were arrested in connection with the shooting.

The University of North Carolina at Charlotte shooting was a school shooting that took place at the University of North Carolina at Charlotte on April 30, 2019. The event, which occurred on the last day of classes for the spring semester, sent six people to the hospital, two of whom were dead upon arrival, and left three others in critical condition. The shooting occurred inside a classroom in the Woodford A. Kennedy Building while students were giving a final presentation. The perpetrator, a former UNCC student called Trystan Andrew Terrell, was arrested shortly afterwards. In September 2019, he pleaded guilty to the murders and was sentenced to life imprisonment without the possibility of parole.