Colombian Americans (Spanish: colombo-estadounidenses or colombo-americanos), are Americans who have Colombian ancestry. The word may refer to someone born in the United States of full or partial Colombian descent or to someone who has immigrated to the United States from Colombia. Colombian Americans are the largest South American Hispanic group in the United States. There are currently two U.S. Senators of Colombian descent: Bernie Moreno of Ohio and Ruben Gallego of Arizona.

Many communities throughout the United States have significant Colombian American populations. Florida (826,391) has the highest concentration and population of Colombian Americans in the United States, followed by New York (311,685), New Jersey (300,637), Texas (134,865), and California (120,873).

The first Colombian immigrants who settled in the United States likely arrived in the 1800s. However, the Colombian presence in the United States would not be known with certainty since the U.S. census included all the South Americans that lived in the United States in the "other Latinos" category.

The first community of Colombian origin was formed after World War I, through the arrival of several hundred professionals (nurses, accountants, laboratory technicians, pharmacists, and bilingual secretaries) that established themselves in New York City; later on, more people were added to the community when Colombian students decided to stay in the U.S. after they finished their studies. Most immigrants settled in Manhattan for many years until the late 1970s when they started to migrate to Jackson Heights, a middle-class neighborhood in the borough of Queens in New York City, that has good housing, schools and churches. The growth of the Colombian population was slow until 1940, when there was an increase in Colombian immigration to New York.

Most Colombians who arrived after the mid-1960s wanted to stay in the United States for a specific time period. Therefore, the number of undocumented Colombian immigrants increased: from 250,000 to 350,000 people in the mid-1970s. Despite the promulgation of many laws against immigration, the number of Colombians that immigrated to the United States did not stop growing. Most of them immigrated to New York. Smaller communities formed in Los Angeles, Houston, Philadelphia, and Washington, D.C., and in the 1970s, North Side, Chicago.

Since the 1980s, many Colombians have immigrated to Miami (especially in its suburbs, such as Doral, Kendall, and Hialeah, and the Weston suburb of Fort Lauderdale). The first Colombians immigrating to the city lived in Little Havana, from where they established commercial relations between Miami and Latin America. The area also attracted wealthy Colombians, who settled there for reasons as diverse as educational, medical or economics.

By the early 1990s, many Colombians left the metropolitan centers and settled in the suburbs to escape crime and high product prices in the city. This trend probably started for the first time in the coastal towns of Connecticut and New York. Colombian communities grew significantly in places such as Stamford, Union City and Englewood, New Jersey, Jacksonville, Florida (which attracted a growing number of people from Miami), and Skokie, Evanston, Arlington Heights and Park Ridge. Despite the migration to other areas, the largest communities remained in New York City, Miami, and their environs.

In 1990 and 1991, 124,745 Colombians legally immigrated to the United States, surpassing immigrants from the rest of Latin America. They were for the first time the most populous group of undocumented immigrants in the United States from Latin America, excluding Mexico. Between 1992 and 1997, the intensity of the conflict in Colombia increased, so nearly 190,000 Colombians immigrated to the United States in this period, many of them going to California.