The Philippine Insular Government (Spanish: Gobierno de las Islas Filipinas) was an unincorporated territory of the United States that was established on April 11, 1899 upon ratification of the 1898 Treaty of Paris. It was reorganized in 1935 in preparation for later independence. The Insular Government was preceded by the Military Government of the Philippine Islands and was followed by the Commonwealth of the Philippines.

The Philippines were acquired from Spain by the United States in 1898 following the Spanish–American War. Resistance led to the Philippine–American War, in which the United States suppressed the nascent First Philippine Republic. In 1902, the United States Congress passed the Philippine Organic Act, which organized the government and served as its basic law. This act provided for a governor-general appointed by the president of the United States, as well as a bicameral Philippine Legislature with the appointed Philippine Commission as the upper house and a fully elected, fully Filipino elected lower house, the Philippine Assembly. The Internal Revenue Law of 1904 provided for general internal revenue taxes, documentary taxes and transfer of livestock. A wide variety of revenue stamps were issued in denominations ranging from one centavo to 20,000 pesos.

The term "insular" refers to the fact that the government operated under the authority of the Bureau of Insular Affairs. Puerto Rico also had an insular government at this time. From 1901 to 1922, the U.S. Supreme Court wrestled with the constitutional status of these governments in the Insular Cases. In Dorr v. United States (1904), the court ruled that Filipinos did not have a constitutional right to trial by jury. In the Philippines itself, the term "insular" had limited usage. On banknotes, postage stamps, and the coat of arms, the government referred to itself simply as the "Philippine Islands".

The 1902 Philippine Organic Act was replaced in 1916 by the Jones Law, which ended the Philippine Commission and provided for both houses of the Philippine Legislature to be elected. In 1935, the Insular Government was replaced by the Commonwealth. Commonwealth status was intended to last ten years, during which the country would be prepared for independence.

The Insular Government evolved from the Taft Commission, or Second Philippine Commission, appointed on March 16, 1900. This group was headed by William Howard Taft, and was granted legislative powers by President William McKinley in September 1900. The commission created a judicial system, an educational system, a civil service, and a legal code. The legality of these actions was contested until the passage of the Spooner Amendment in 1901, which granted the U.S. president authority to govern the Philippines.

The Insular Government saw its mission as one of tutelage, preparing the Philippines for eventual independence. On July 4, 1901, Taft was appointed "civil governor", who also named his cabinet at his inaugural address. Military Governor Adna Chaffee retained authority in disturbed areas. On July 4, 1902, the office of military governor was abolished, and Taft became the first US governor-general of the Philippine Islands.

The Philippine Organic Act disestablished the Catholic Church as the state religion. In 1904, Taft negotiated the purchase of 390,000 acres (160,000 ha) of church property for $7.5 million. Despite this, the Insular Government failed to investigate the land titles of the friars' and restore them to the patrimony of the Filipinos. The Insular Government then established a land titling system for these lands, but due to a small surveyor staff, a lot of parcels of land remained untitled.

Two years after the completion and publication of a census, a general election was conducted for the choice of delegates to a popular assembly. An elected Philippine Assembly was convened in 1907 as the lower house of a bicameral legislature, with the Philippine Commission as the upper house. The 1909 U.S. Payne–Aldrich Tariff Act provided for free trade with the Philippines. Every year from 1907, the Philippine Assembly (and later the Philippine Legislature) passed resolutions expressing the Filipino desire for independence.