Seyyed Abdollah Behbahani (Persian: سیدعبدالله بهبهانی, 1840–1910) was a Shi'a theologian and a prominent leader of the constitutional movement.

He was educated in Najaf by scholars such as Morteza Ansari,[1] Hosayn Kuhkamarai, Mirza Ḥasan Sirazi, and Shaikh Rażi Naǰafi and became qualified to provide religious guidance.

His campaigns included refusing to participate in the Tobacco Protest;[2] being dissatisfied with the selection of Ein al-Dowleh as grand vizier;[3] desiring to conclude a solidarity treaty with Seyyed Mohammad Tabatabai; agreeing to fight against the ruler at that time (Ahmad Kasravi referred to this treaty as the beginning of the Persian Constitutional Revolution);[2] circulating the photo of Naus (the Belgian supervisor of the Iranian customs) wearing Islamic scholar clothes at a Masquerade ball and asking for him to be dismissed;[2] seeking sanctuary in Rey after objections were raised to the rise in the price of sugar, and punishing the merchants involved; establishing an assembly known as the Islamic seminary aimed at stopping sabotage by Ein al-Dowleh for founding the house of justice;[2] and emigrating to Iraq as a protest against the failures of the government (this migration is now considered to be a major migration).

Mirza Sayyed Mohammad Tabatabai accepted his request and a solidarity treaty was concluded between him and Seyyed Abdollah Behbahani.

Seyyed Abdollah Behbahani and Mirza Sayyed Mohammad Tabatabai were not deputies or members of the Majlis, but they participated in the whole of the meeting.