Eastern Samar (Waray-Waray: Sinirangan Samar; Tagalog: Silangang Samar), officially the Province of Eastern Samar, is a province in the Philippines located in the Eastern Visayas region. Its capital is the city of Borongan, which is the most populous. Eastern Samar occupies the eastern portion of the island of Samar. Bordering the province to the north is the province of Northern Samar and to the west is Samar province. To the east lies the Philippine Sea, part of the vast Pacific Ocean, while to the south lies Leyte Gulf.

During his circumnavigation of the globe, Ferdinand Magellan had set foot on the tiny island of Homonhon in the southern part of the province. On March 16, 1521, the area of what is now Eastern Samar is said to be the first Philippine landmass spotted by Magellan and his crew.

In 1596, many names, such as Samal, Ibabao, and Tandaya, were given to Samar Island prior to the coming of the Spaniards in 1596. During the early days of Spanish occupation, Samar was under the jurisdiction of Cebu. Samar and Leyte were later separated from Cebu in 1735. They were split in 1747 but was reversed in 1762 with the approval of the King of Spain, following complaints from the Jesuits. The province of Samar was later established as a distinct province in 1768 after it got separated from the province of Leyte. In 1777, Samar and Leyte split for the last time when it was approved in Madrid in 1786 and had been effective in 1799.

Maj. Eugenio Daza Area Commander of General Lukbán's forces for Southeastern Samar

In 1944, combined Filipino-American troops involved in the liberation of the Philippines from Japan built in the town of Guiuan the largest military base in the Pacific. In the same town in 1949, approximately 5,000 Russian refugees escaping from communist China temporarily settled on Tubabao Island until 1951, when they were transferred to Australia and the United States.

Eastern Samar, as a province, was created from Samar province through Republic Act No. 4221 on June 19, 1965. Approved by Congress in 1963, it was authored by Samar congressmen Eladio T. Balite (1st district), Fernando R. Veloso (2nd district), and Felipe J. Abrigo (3rd district). The law, ratified in a plebiscite on June 19, 1965, divided Samar into three: Northern Samar, Eastern Samar and (Western) Samar. The first provincial officials of Eastern Samar, aside from the lone district representative, were elected on November 14, 1967, and on January 1, 1968, they officially assumed office.

The capital town of Borongan became a component city by virtue of Republic Act No. 9394 which sought to convert the municipality into a city. The law was ratified on June 21, 2007. However, the cityhood status was lost twice in the years 2008 and 2010 after the LCP questioned the validity of the cityhood law. The cityhood status was reaffirmed after the court finalized its ruling on February 15, 2011, declaring the cityhood law constitutional.

Typhoon Haiyan (Yolanda), one of the strongest typhoons ever recorded, made its first landfall in the coastal town of Guiuan in November 2013.

Eastern Samar covers a total area of 4,660.47 square kilometers (1,799.42 sq mi) occupying the eastern section and majority of southern Samar's coast of Samar Island in the Eastern Visayas region. The province is bordered to the north by Northern Samar and to the west by Samar. To the east lies the Philippine Sea, part of the vast Pacific Ocean, while to the south lies Leyte Gulf.

Because it faces the Philippine Sea of the Pacific Ocean, Eastern Samar suffers heavily from powerful typhoons.

Eastern Samar comprises 22 municipalities and one city, all encompassed by an lone congressional district and two provincial districts that elect a representative and provincial board members, respectively.

Population census of Eastern Samar

Year	Pop.	±% p.a.
1903	79,645	—
1918	117,348	+2.62%
1939	154,347	+1.31%
1948	197,734	+2.79%
1960	237,747	+1.55%
1970	271,000	+1.32%
1975	287,149	+1.17%
1980	320,637	+2.23%
1990	329,335	+0.27%
1995	362,324	+1.80%
2000	375,822	+0.79%
2007	405,114	+1.04%
2010	428,877	+2.10%
2015	467,160	+1.64%
2020	477,168	+0.42%
Source: Philippine Statistics Authority

The population of Eastern Samar in the 2020 census was 477,168 people, with a density of 100 inhabitants per square kilometre or 260 inhabitants per square mile. The predominant language is Waray and it is the main lingua franca of the entire island of Samar.

In the 2000 Census, Warays comprised 97.78% (366,787) of the total provincial population of 375,124 at that time. Kapampangan came second at 0.55% (2,067), Bisaya/Binisaya 0.43% (1,613), Cebuano at 0.18% (680), and Tagalog at 0.17% (621).

The people of the province are devoted catholics where a majority adhere to Roman Catholicism. The dominant Catholic faith influences the events of the provincial education, politics and social functions of the people.

Other Christians usually form the remaining groups of believers such as the Born-again Christians, Protestants, Iglesia Filipina Independiente or Aglipayan church, Jehovah's Witnesses, Iglesia ni Cristo, Baptists, Methodists, The Church of Jesus Christ of Latter-day Saints, and Seventh-day Adventists. Non Christians (mostly Muslims) are also found.

The province has one operational airport; Borongan Airport located in the capital city. Currently, only Leascor operates out of Borongan Airport with flights weekly to serve locals and tourists to and from Cebu.

By land, mini buses and vans ply from the regional center in Tacloban, Catbalogan, and Calbayog in Samar province and to some towns in Eastern Samar. From Borongan, buses ply to Metro Manila. Motorized boats plies through Leyte Gulf ferrying passengers going to Tacloban City seaport.

Commercial activities in the province are centered on the provincial capital of Borongan while tourism activities are centered in Guiuan town where Calicoan Island and the historical Homonhon Island are located. Generally, the province's major economic resource is fishery and agriculture which include production of coconut, copra, corn, rice, sugar, and vegetables. Tourism potential is untapped on the northern part of the province.

• Boy Abunda - television host, publicist, talent manager and celebrity endorser.
• Maria Fe Abunda - politician; Eastern Samar's representative in the House of Representatives of the Philippines.
• Aster Amoyo - entertainment writer, television host, and talent manager.
• Gabrielle Camille Basiano - model and beauty pageant titleholder, Binibining Pilipinas Intercontinental 2022.
• K Brosas - actress, comedienne and singer.
• Eugenio Daza - Area Commander Southeastern Samar during the Philippine-American War. Organizer of the Balangiga Encounter. Rep. of Samar's 3rd District to the First Philippine Legislature.
• Gabriel Daza - Knight Commander with Star of the Order of St. Sylvester, knighted by Pope Pius XII. Co-founder Boy Scouts of the Philippines.
• R-Ji Lim - singer, actor and model; member of P-pop group Alamat.
• Jewel Ponferada - PBA professional basketball player, currently playing for Rain or Shine Elasto Painters.
• Art Ramasasa - singer, songwriter and musician in the Waray-Waray language.
• Mastermind - dance group, made popular in their performance in Pilipinas Got Talent season 5. They finally settled for 4th place in the Grand Finals.
• Freddie Abuda - retired professional basketball player, currently serving as an assistant coach to the San Beda Red Lions (NCAA).
• Lutgardo Barbo - Former governor of Eastern Samar, Candidate for the 2022 Senate Elections.
• Marcelino Libanan - Filipino politician
• Andres Pagaran - poet and songwriter

• Eastern Samar travel guide from Wikivoyage
• Media related to Eastern Samar at Wikimedia Commons
• Geographic data related to Eastern Samar at OpenStreetMap
• Philippine Standard Geographic Code
• Local Governance Performance Management System