* Andrew Ainslie Common ( 1841 – 1903 ), built his own very large reflecting telescopes and demonstrated that photography could record astronomical features invisible to the human eye.

* 1903 – The Kishinev pogrom in Kishinev ( Bessarabia ) begins, forcing tens of thousands of Jews to later seek refuge in Israel and the Western world.

* 1903 – Mickey Cochrane, American baseball player ( d. 1962 )

* 1903 – Harold Edgerton, American electrical engineer ( d. 1990 )

* 1903 – Jan Tinbergen, Dutch economist, recipient of the Bank of Sweden Prize ( d. 1994 )

* 1903 – Ferenc Keserű, Hungarian water polo player ( d. 1968 )

* 1819 – Sir George Stokes, 1st Baronet, Irish-English mathematician and physicist ( d. 1903 )

After what the MCC saw as the problems of the earlier professional and amateur series they decided to take control of organising tours themselves, and this led to the first MCC tour of Australia in 1903 – 04.

* 1903 – Fall of the Ottoman Empire: an unsuccessful uprising led by the Internal Macedonian Revolutionary Organization against Ottoman Turkey, also known as the Ilinden – Preobrazhenie Uprising, takes place.

In Serbia Nikola Pašić ( 1845 – 1926 ) and his Radical Party dominated Serbian politics after 1903 ; they also monopolized power in Yugoslavia from 1918 to 1929 ; during the dictatorship of the 1930s, it furnished the prime minister.

* 1903 – Habib Bourguiba, Tunisian politician ( d. 2000 )

* 1903 – Louis Leakey, Kenyan-English archaeologist ( d. 1972 )

* 1903 – A 30 million cubic-metre landslide kills 70 in Frank, Alberta, Canada.

* 1876 – Alexander I of Serbia ( d. 1903 )

* Adrian ( costume designer ) ( 1903 – 1959 ), born Adrian Adolph Greenberg, costume designer for over 250 films

* Adrian Rollini ( 1903 – 1956 ), American multi-instrumentalist best known for his jazz music

* 1903 – German engineer Karl Jatho allegedly flies his self-made, motored gliding airplane four months before the first flight of the Wright brothers.

* 1903 – James Gould Cozzens, American novelist ( d. 1978 )

* 1903 – Lewis Sargent, American actor ( d. 1970 )

* 1826 – Karl Gegenbaur, German anatomist ( d. 1903 )

* 1903 – Arpad Elo, American chess player, created the Elo rating system ( d. 1992 )

Alexander I or Aleksandar Obrenović ( Cyrillic: Александар Обреновић ; 14 August 1876 – 11 June 1903 ) was king of Serbia from 1889 to 1903 when he and his wife, Queen Draga, were assassinated by a group of Army officers, led by Colonel Dragutin Dimitrijević

In the early 20th century, Thessaloniki was in the center of radical activities by various groups ; the Bulgarian-Macedonian Internal Macedonian Revolutionary Organization, founded in 1897, and the Greek Macedonian Committee, founded in 1903.

By 1903, there were discussions on establishing administrative control by Russian and Austrian advisory boards in the Macedonian provinces.

* Duncan Perry The Politics of Terror: The Macedonian Liberation Movements, 1893 – 1903, Durham, Duke University Press, 1988. pp. 40 – 41, 210 n. 10.

Georgi Nikolov Delchev ( 1872 – 1903 ) ( Bulgarian / Macedonian: Георги Николов Делчев, known as Gotse Delchev, also spelled Goce Delčev, Cyrillic: Гоце Делчев, originally spelled Гоце Дѣлчевъ ) was an important revolutionary figure in Ottoman-ruled Macedonia and Thrace at the turn of the 20th century.

* Duncan Perry The Politics of Terror: The Macedonian Liberation Movements, 1893 – 1903, Durham, Duke University Press, 1988. pp. 40 – 41, 210 n. 10.

His most important work is the book " On Macedonian Matters ", published in Sofia in 1903.

Misirkov's most important writing is undoubtedly the book Za makedonckite raboti ( On Macedonian Matters ) published in 1903 in Sofia, in which he laid down the principles of the modern Macedonian language.

Voivoda s from the Internal Macedonian Revolutionary Organisation in Kruševo, 1903.

In order to strengthen Greek efforts for Macedonia, the Makedoniko Komitato ( Μακεδονικό Κομιτάτο, meaning " Macedonian Committee ") was formed in 1903, under the leadership of wealthy publisher Dimitrios Kalapothakis ; its members included Ion Dragoumis and Pavlos Melas.

On August 2, 1903, the citizens of Kičevo joined the struggle for Macedonian independence, led by Arso Vojvoda and Yordan Piperkata.

# Interview with Elefterija Vambakovska, Macedonian Institute for National History, article " Одважноста на претседателот на Крушевската Република ", and interview with Nikola Karev from May 8, 1903, article " Разговорот на грчкиот новинар со Никола Карев ", Macedonian newspaper " Utrinski vesnik ", published on 22.

Pitu Guli ( Cyrillic: Питу Гули ; 1865, Kuruşova – 1903, Kuruşova, Ottoman Empire ) was an Aromanian revolutionary in Ottoman Macedonia, a local leader of what is commonly referred to as the Internal Macedonian Revolutionary Organization ( IMRO ).

In September 1903 he accompanied Nicholas II to Vienna and Mürzzuschlag. Lamsdorf was anxious to prevent the collapse of the Ottoman Empire in the face of Slavic nationalism and emphatically condemned the Ilinden-Preobrazhenie Uprising and other activities of the Internal Macedonian Revolutionary Organization.

In 1903, a short-lived Kruševo Republic was proclaimed in the south-western part of present-day Republic of Macedonia by the rebels of the Ilinden-Preobrazhenie Uprising.

When the revolution came in November 1903, the United States intervened to protect the rebels, who succeeded in taking over the province, declaring it independent as the Republic of Panama.

The Kruševo Republic was a short-lived political entity proclaimed in 1903 by rebels from the Secret Macedonian-Adrianople Revolutionary Organization in Kruševo during the Ilinden – Preobrazhenie Uprising.

On 3 August 1903, the rebels captured the town of Krushevo and established a revolutionary government, proclaiming the Krushevo Republic, which was one of the first modern day republic in the Balkans.

During the Ilinden Uprising of August 1903, when Kruševo was captured by the rebels, Nikola Karev authored the Kruševo Manifesto, which outlined the aims of the Uprising, and became the head of its provisional government.

The rebels under the leadership of Anastacio de la Cruz encountered the forces of Lt. Walker on Holy Thursday on April 1903.

During the Ilinden Uprising in 1903 the rebels proclaimed a short lived Kruševo Republic.