She is the daughter of former Dhaka University professor Shafique Ahmed Siddique,[6][7][8] and Sheikh Rehana,[6] who gained political asylum in the UK as a teenager.

[8] In the 2010 local government elections, she became the first female Bangladeshi councillor for Camden Council,[24] where she was Cabinet Member for Culture and Communities until May 2014.

[26][27] In July 2013, Siddiq was selected by local party members as the Labour prospective parliamentary candidate for the Hampstead and Kilburn constituency,[22][28][29][30][31] despite a smear campaign.

[32] She later said that because of her Muslim surname, she was advised against standing in the constituency by senior party members, due to Hampstead's large Jewish population.

[47] In September 2015, Siddiq, along with Keir Starmer and Catherine West, wrote a letter to British Prime Minister David Cameron seeking urgent action to address the refugee crisis due to the Syrian Civil War.

[63][64] In August 2017, Siddiq called for businesses to "address imbalance" in the employment of people from ethnic minorities to improve the diversity of its workforce.

[66] In the same month, she wrote to the Home Office to ask for children's passports to be amended to contain both their parents' names to avoid confusion at airports and borders.

She had been stopped with her daughter at UK border control whilst returning from a family holiday until her husband joined them, because she did not have the same surname in her passport as her child.

[67][68][69] In November 2017, whilst campaigning for the release of her constituent, the British-Iranian citizen Nazanin Zaghari-Ratcliffe, who was detained in Iran, she was asked by Alex Thomson of Channel 4 News and ITN about using her family ties to the Bangladeshi government, led by her aunt, in order to liberate British Bangladeshi barrister Ahmad Bin Quasem, who is thought to have been abducted by state security forces in Bangladesh.

The protest has been twofold – to highlight the shocking conditions which Palestinians are forced to live in and to demand their right to return to their homes..."[74] In August 2018, she joined international calls for her aunt's government to release Bangladeshi photographer Shahidul Alam, who had been jailed after reporting about protests by schoolchildren over road safety problems, and had subsequently stated he was tortured.

[79] In December 2024, Bangladesh's Anti-Corruption Commission (ACC) named Siddiq in an investigation into infrastructure projects, including a 2013 deal with Russia for Rooppur Nuclear Power Plant, in which it is claimed up to £3.9 billion was embezzled.

Siddiq attended the nuclear deal's signing at the Kremlin alongside her aunt Bangladesh PM Sheikh Hasina and Russian President Vladimir Putin.

The incident occurred after the producer questioned Siddiq about her perceived failure to address the enforced disappearance of British-trained barrister Mir Ahmad Bin Quasem in Bangladesh during her aunt Sheikh Hasina's tenure as Prime Minister, a government widely criticized for human rights abuses and authoritarian rule.

[97][98] In 2019, Siddiq denied involvement in Bangladeshi politics but faced accusations of utilizing Awami League supporters in her Hampstead and Kilburn campaign.

[101] In 2015, Siddiq spoke at an event for the Centre for Research and Information (CRI), a group accused of disseminating misinformation in support of Sheikh Hasina's government.

[103] Two years earlier, she faced scrutiny for living in a home owned by Salman F Rahman, an Awami League minister and business tycoon.

[103] In January 2025, it was revealed that Siddiq was gifted a flat in London in 2004 by Abdul Motalif, a property developer linked to the Awami League.

[105] In the same month, The Telegraph reported that Siddiq, along with Awami League MP Kazi Nabil Ahmed, attended two matches of the 2019 Cricket World Cup as a freebie.

[116] Bangladesh's Anti-Corruption Commission (ACC) confirmed it is liaising with almost twelve countries to repatriate money laundered by Tulip Siddiq and her families.

[119] Her resignation came amid growing pressure over her connections to corruption allegations in Bangladesh involving her aunt, Sheikh Hasina, the former prime minister who was ousted in August 2024[120].Siddiq was named in multiple corruption investigations in Bangladesh: In her resignation letter, Siddiq maintained her innocence but acknowledged that the ongoing situation could distract from the government's work.

Prime Minister Keir Starmer accepted her resignation, noting that no evidence of financial misconduct had been found.The UK Anti-Corruption Coalition called for Siddiq to relinquish her economic crime responsibilities due to a potential conflict of interest, given her family ties to the deposed regime in Bangladesh.

[131] Siddiq and her family live in a semi-detached house in East Finchley rented from an official of the London branch of the Bangladesh Awami League.