Kafeel Ahmed, aka Khalid Ahmed and Khaled Ahmad, (1 January 1979 – 2 August 2007) was an Indian Muslim born in Bangalore, India and raised in Saudi Arabia during his doctor parents' tenure there. He was an engineer who was studying for a PhD in computational fluid dynamics. He was often mistakenly referred to as a medical doctor. He was arrested in Great Britain in the aftermath of the 2007 Glasgow International Airport attack. He was held hospitalized at the Glasgow Royal Infirmary in a critical condition, after he suffered severe burns in the attack. He had suffered burns to 90% of his body, and was not expected to survive—he had already been revived twice as of 4 July. The Sun reported Britain's National Health Service was paying over £5,000 a day to keep him alive, while security sources said this amount reaches £30,000 when security costs are included.

Mobile phone records have shown that, during his 2005-2007 stay in India, Ahmed had frequent communications with Malta, the UK, Finland, Saudi Arabia and Oman. In May 2007, prior to departing to Britain from his native Bangalore, he entrusted his mother with a compact disk he said contained some important information on his "project." The disk has been handed over to police for analysis. Although the analysis is not yet complete, it had been revealed that the disk contained speeches by al-Qaeda leader Osama bin Laden, propaganda against the United States and Britain, some Jihad literature and the plight of the Muslims in Iraq, Afghanistan and Chechnya. It transpired that Ahmed attentively followed campaigns in Iraq, Afghanistan and Palestine, and frequented Islamist chat rooms on the internet. Digital material found included graphic depictions of real-life occurrences of torture in Chechnya, hundreds of bomb design from the internet, and evidence that he used the Bangalore-based political platform, Discover Islam, for the purposes of recruitment.

Kafeel was the brother of Dr. Sabeel Ahmed, also arrested in the aftermath of the attack. A suicide note left behind indicates that the passenger of the vehicle, Bilal Abdullah, and himself, intended to die in the attack.