Ladan and Laleh Bijani (Persian: لادن و لاله بیژنی; 17 January 1974 – 8 July 2003) were Iranian conjoined twin sisters.

They were born in Firuzabad, a city in southwest Iran, to Dadollah Bijani and Maryam Safari, members of a farming family from the nearby Lohrasb village.

The Bijani sisters were lost in a hospital in 1979 after the doctors responsible for them had to suddenly leave for the United States during the revolution in Iran.

The Bijanis' parents did not find the sisters again until several years later in the city of Karaj near Tehran, where Alireza Safaian had adopted them.

After eight months in Singapore, doing extensive psychiatric and legal evaluations, they underwent surgery on 6 July 2003, under the care of a large team of international specialists at Raffles Hospital, composed of 28 doctors and more than 100 medical assistants working in shifts.

[2] The attempt to separate the twins turned out to be very difficult, because their brains not only shared a major vein (the superior sagittal sinus), but had fused together.

[1] The separation was achieved on 8 July 2003, but it was announced then that the twins were in critical condition, both having lost a large volume of blood due to complications of the operation.