James Weldon Johnson (June 17, 1871 – June 26, 1938) was an American writer and civil rights activist. He was married to civil rights activist Grace Nail Johnson. Johnson was a leader of the National Association for the Advancement of Colored People (NAACP), where he started working in 1917. In 1920, he was chosen as executive secretary of the organization, effectively the operating officer. He served in that position from 1920 to 1930. Johnson established his reputation as a writer, and was known during the Harlem Renaissance for his poems, novel and anthologies collecting both poems and spirituals of Black culture. He wrote the lyrics for "Lift Every Voice and Sing", which later became known as the Black National Anthem, the music being written by his younger brother, composer J. Rosamond Johnson.

Johnson was appointed under President Theodore Roosevelt as U.S. consul in Venezuela and Nicaragua for most of the period from 1906 to 1913. In 1934, he was the first African American professor to be hired at New York University. Later in life, he was a professor of creative literature and writing at Fisk University, a historically Black university. In recognition of his scholarship and impact, New York University established the James Weldon Johnson Professorship in 2020.

Johnson was born in 1871 in Jacksonville, Florida, the son of James Johnson, a biracial headwaiter and Helen Louise Dillet, a native of Nassau in the Bahamas. His maternal great-grandmother, Hester Argo, had escaped from Saint-Domingue (today Haiti) during the revolutionary upheaval in 1802, along with her three young children, including James' grandfather Stephen Dillet (1797–1880). Although originally headed to Cuba, their boat was intercepted by privateers and they were taken to Nassau, where they permanently settled. In 1833, Stephen Dillet became the first man of color to win election to the Bahamian legislature.

James' brother John Rosamond Johnson became a composer. The boys were first educated by their mother, a musician and public-school teacher, before attending Edwin Stanton School. After James earned his Bachelor's degree, he also completed some graduate coursework.

The achievement of his father, a preacher and the headwaiter at the St. James Hotel, a luxury establishment built when Jacksonville was one of Florida's first winter resort destinations, inspired young James to pursue a professional career. Molded by the classical education for which Atlanta University was known, Johnson regarded his academic training as a trust. He knew he was expected to devote himself to helping Black people advance. Johnson was a prominent member of Phi Beta Sigma fraternity.

Johnson and his brother Rosamond moved to New York City as young men, joining the Great Migration out of the South in the first half of the 20th century. They collaborated on songwriting and achieved some success on Broadway in the early 1900s. Over the next 40 years, Johnson served in several public capacities, working in education, the diplomatic corps, and civil rights activism. In 1904, he participated in Theodore Roosevelt's successful presidential campaign. After becoming president, Roosevelt appointed Johnson as United States consul at Puerto Cabello, Venezuela, where he served from 1906 to 1908, and then to Nicaragua, where he served from 1909 to 1913.

In 1910, Johnson married Grace Nail, whom he had met in New York City several years earlier while he was working as a songwriter. A cultured, well-educated New Yorker, Grace Nail Johnson later collaborated with her husband on a screenwriting project. After their return to New York from Nicaragua, Johnson became increasingly involved in the Harlem Renaissance, a great flourishing of art and writing. He wrote his own poetry and supported work by others, also compiling and publishing anthologies of spirituals and poetry. Owing to his influence and his innovative poetry, Johnson became a leading voice in the Harlem Renaissance of the 1920s.

Johnson became involved in civil rights activism, especially the campaign to pass the federal Dyer Anti-Lynching Bill, as Southern states did not prosecute perpetrators. He was a speaker at the 1919 National Conference on Lynching. Starting as a field secretary for the NAACP in 1917, Johnson rose to become one of the most successful officials in the organization. He traveled to Memphis, Tennessee, for example, to investigate a brutal lynching that was witnessed by thousands. His report on the carnival-like atmosphere surrounding the burning-to-death of Ell Persons was published nationally as a supplement to the July 1917 issue of the NAACP's Crisis magazine, and during his visit there he chartered the Memphis chapter of the NAACP. His 1920 report about "the economic corruption, forced labor, press censorship, racial segregation and wanton violence introduced to Haiti by the U.S. occupation encouraged numerous African Americans to flood the State Department and the offices of Republican Party officials with letters" calling for an end to the abuses and to remove troops. The United States finally ended its occupation of Haiti in 1934, 16 years after the threat of Germany in the area had been ended by its defeat in the First World War.