Aljunied is a sub-urban area located in the central part of the city-state of Singapore. Named after Aljunied Road, it was formerly agricultural land which has since been heavily urbanised and presently comprises a variety of land uses. Today, Aljunied is a bustling neighbourhood with HDB flats with amenities like shops, schools, parks and recreational facilities, as well as quite a number of traditional Singaporean shophouses.

Aljunied Road was officially named in 1926 after Syed Sharif Omar bin Ali Al Junied (died 1852), who owned large tracts of agricultural land in the area.

Syed Sharif Omar bin Ali Al Junied was a wealthy Hadhrami Arab merchant from Palembang, where he had set up business after migrating from his hometown in Tarim, Yemen. He was also a highly respected man, looked upon by the Malays as a prince. Syed Omar came from the well-respected Arab family who were descendants of Islamic prophet Muhammad. He was a nephew of Syed Mohammed bin Harun Al Junied, who also came from Palembang to Singapore before the founding of modern Singapore in 1819.

Syed Omar was a philanthropist and his charitable acts included donating what is now called Jalan Kubor Cemetery, a large plot of land in Victoria Street for the purposes of a Muslim burial ground, the construction of a mosque in Bencoolen Street and Masjid Kampong Melaka, renamed Masjid Omar Kampong Melaka in his honour. The land where St Andrew's Cathedral stands was also donated by him. He and his family contributed largely thanks to the setting up of the Tan Tock Seng Hospital. Syed Omar's descendants continue to reside in Singapore.

In 1927, one of his descendants, Syed Abdul Rahman Aljunied, built the Madrasah Aljunied Al-Islamiah on a vacant ground next to Jalan Kubor Cemetery in commemoration of his grandfather, Syed Omar. Madrasah Aljunied was a leading Islamic religious school which produced many religious leaders of Southeast Asian countries.

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• St Magdalene's Kindergarten

• Canossa Catholic Primary School

• CHIJ Our Lady of Good Counsel

• Geylang Methodist School (Primary)

• Kong Hwa School

• Geylang Methodist Secondary School

• Canossian School

• MacPherson Secondary School

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Aljunied formerly falls under Aljunied Constituency from 1959 to 1988. In 1968, the MacPherson area of Aljunied was under MacPherson Constituency and in 1988, renamed as MacPherson Single Member Constituency (SMC). In 1988, both wards were merged into Aljunied Group Representation Constituency (GRC).

In 1991, the Macpherson area went under Marine Parade GRC and then became its own individual constituency again as MacPherson Single Member Constituency (SMC) again in 1997. In 2001, the Macpherson area was merged back into Marine Parade GRC again and split back as MacPherson SMC again in 2015.

• Aljunied MRT station
• Geylang East Public Library
• Buddhist Library (Singapore)
• Foo Hai Ch'an Monastery

• Victor R Savage, Brenda S A Yeoh (2003), Toponymics - A Study of Singapore Street Names, Eastern Universities Press, ISBN 981-210-205-1
• Thong Kheng Charitable Institution
• Syed Sharif Omar al-Junied
• Madrasah Aljunied al-Islamiah
• Masjid Omar Kampong Melaka