A Pakistani court has sentenced four men to death over the mob killing of a woman who married against her family's wishes.

Farzana Perveen, who was pregnant at the time, was beaten to death by her relatives outside a courthouse in the eastern city of Lahore on May 27.

Court official Imtiaz Ahmed says the woman's father was among those sentenced to death today.

Arranged marriages are the norm among conservative Pakistanis, and hundreds of women are murdered every year in so-called honour killings carried out by husbands or relatives as a punishment for alleged adultery or other illicit sexual behaviour.