| Country: | Iran |
| Joint Staff of the Islamic Republic of Iran Army | |
| Native Name: | Persian: ستاد مشترک ارتش جمهوری اسلامی ایران |
| Founded: | 1921 |
| Current Form: | 1998 |
| Headquarters: | Tehran, Iran |
| Commander-In-Chief: | Major general Abdolrahim Mousavi |
| Commander: | Rear admiral Habibollah Sayyari |
| Commander Title: | Chief of staff |
The Joint Staff of the Islamic Republic of Iran Army (Persian: ستاد مشترک ارتش جمهوری اسلامی ایران), acronymed SEMAJA (Persian: سماجا), is the chief of staff of the Islamic Republic of Iran Army, the conventional military of Iran, with an aim to coordinate its four military branches. The Joint Staff has Central Provost and University of Command and Staff under control.
From 1921 to 1998, "Chairman of Chief of Staff" (Persian: رئیس ستاد مشترک ارتش) was the highest-ranking position within the Artesh, however after the newly established office "Commander-in-Chief of Artesh" (Persian: فرمانده کل ارتش) position was founded in 1998, the former position was deposed as a decision-making position and became the coordinator deputy of the Chief Commander (Persian: معاونت هماهنگکننده ارتش). The position is currently held by Rear Admiral Habibollah Sayyari, who is second-in-command and deputy of Major general Abdolrahim Mousavi.