Asmā' bint Abu Bakr (Arabic: أسماء بنت أبي بكر), c. 595 – 692 CE, was one of the companions of the Islamic prophet Muhammad.
She was Abu Bakr's daughter. Her mother was Qutaylah bint Abd-al-Uzza, and she was the full sister of Abdullah ibn Abi Bakr. Her half-sisters were Aisha and Umm Kulthum bint Abi Bakr, and her half-brothers were Abdul-Rahman ibn Abi Bakr and Muhammad ibn Abi Bakr. She also had a stepmother from the Kinana tribe, Umm Ruman bint Amir, and a stepbrother, al-Tufayl ibn al-Harith al-Azdi. The historians Ibn Kathir and Ibn 'Asakir cite a tradition that Asma was 10 years older than Aisha; but according to Al-Dhahabi, the age difference was thirteen to nineteen years.
Asma’s parents were divorced "in the Jahiliyya," i.e. before Islam. She remained in her father’s house.
Asma was one of the first to accept Islam, being listed fifteenth on Ibn Ishaq's list of "those who accepted Islam at the invitation of Abu Bakr".
When Muhammad and Abu Bakr sought refuge in the cave of Thawr outside Mecca on their migration to Medina in 622, Asma used to carry food to them under cover of dark. When the Prophet and Abu Bakr left the cave, Asma tied the goods with the two belts of her cover, and for this ingenuity she received from Muhammad the title Dhat an Nitaqayn meaning She of the Two Belts.