Ahmad ibn Mubarak was the seventh Tayyibi Isma'ili in Yemen, from 1229 to his death in 1230.
Ahmad was the son of Mubarak, brother of the fifth, Ali. Upon assuming office, he dispatched emissaries to various places in Yemen and India. Sanaa remained his seat of administration and he maintained cordial relations with various rulers in Yemen.
He was succeeded by al-Husayn, the son of Ali ibn Muhammad.