Alexander Lawrence Posey (August 3, 1873 – May 27, 1908) was a Native American poet, humorist, journalist, and politician in the Muscogee (Creek) Nation. He founded the Eufaula Indian Journal in 1901, the first Native American daily newspaper. For several years he published editorial letters known as the Fus Fixico Letters, written by a fictional figure who commented pointedly about Muscogee Nation, Indian Territory, and United States politics during the period of the dissolution of tribal governments and communal lands. He served as secretary to the Sequoyah Constitutional Convention and drafted much of the constitution for its proposed Native American state, but Congress rejected the proposal. Posey died young from drowning while trying to cross the flooding North Canadian River in Oklahoma.

Alexander Posey was born on August 3, 1873, near present-day Eufaula, Creek Nation in Indian Territory. He was the oldest of 12 children, and his parents were Lewis Henderson "Hence" Posey, of Scots-Irish and Muscogee Creek ancestry, from the Muscogee Berryhill family and Nancy (Phillips) Posey (Muscogee name: Pohas Harjo), who was Muscogee and a member of the Harjo family.

The Muscogee have a matrilineal kinship system, by which Posey and his siblings were considered born into his mother's Wind Clan of the Tuskegee tribal town. They inherited her clan, and property and hereditary positions were passed through her line. Posey's father, Lewis H. Posey, was born to a Scots-Irish and Muscogee family, and he was a citizen of the Muscogee Nation. He had been orphaned at an early age and raised in the Creek Nation; he spoke the Muscogee language fluently; and he was made a member of the Broken Arrow tribal town. Young Alexander and his siblings spoke Muscogee as their first language. As they grew older, their father insisted they speak English as well; when Posey was fourteen, his father would punish him if he spoke Muscogee. From that time, Posey received a formal education, including three years at Bacone Indian University in Muskogee, Oklahoma.

In 1896 at 23 years old, Posey married Minnie Harris, a schoolteacher. Together they had three children, Yahola Irving, Pachina Kipling, and Wynema Torrans Posey, each with a middle name drawn from one of the couple's literary heroes.

Posey studied writing at Bacone College. He read naturalists such as John Burroughs and Henry David Thoreau, who inspired him to write about the landscape of his childhood.

After college, he worked at Indian Journal, where he published poems. In 1895, he represented the Wind Clan as a member of the Creek National Council. He was also the director of a Creek orphanage.

In 1901, Posey edited the newspaper, Eufaula Indian Journal. He gained national recognition for founding the first Indian-published daily newspaper.

In 1906, Posey was secretary for the Sequoyah Constitutional Convention, called to draft a constitution for a state to be majority Native American. According to the Encyclopedia of Oklahoma, he is credited with having written most of that constitution. The Native Americans hoped to gain a state of their own, in the period when whites were pushing for the Oklahoma and Indian territories to be admitted as a state to the Union. The Native Americans were not successful. Their tribal structures were dissolved as part of extinguishing Native American land title in what became the state of Oklahoma.