| Unit Name: | 77th Infantry Division |
| Native Name: | Persian: لشکر ۷۷ پیاده |
| Branch: | Ground Forces of Islamic Republic of Iran Army |
| Type: | Infantry |
| Role: | Combined arms |
| Size: | Division |
| Garrison: | Mashhad, Razavi Khorasan Province |
| Nickname: | "Lashkare Pirooz-e Samen-ol-A'emeh" (The Victorious Division of Samen-ol-A'emeh) |
| Equipment: | M47 Patton M48M Patton BTR-50 T-72S[1] |
| Commander1: | Governor-General Yaghob-Ali Nazari |
| Commander2: | Second Brig. Gen. Ali Jahanshahi |
| Commander2 Label: | Current commander |
| Notable Commanders: | Ataollah Salehi |
| Battles: | 1979 Kurdish rebellion Iran–Iraq War |
77th "Pirooz-e Samen-ol-A'emeh" Infantry Division of Khorasan (Persian: لشکر پیاده ۷۷ پیروز ثامنالائمه خراسان) is an infantry division of the Ground Forces of Islamic Republic of Iran Army based in Mashhad, Razavi Khorasan Province.[2] It was formerly being called 77th Infantry Division of Khorasan and was renamed to "The Victor of Samen-ol-A'emeh" (Persian: پیروز ثامنالائمه Pirooz-e Samen-ol-A'emeh) later after the successful Operation Samen-ol-A'emeh during Iran–Iraq War, which was led by this division.
It was active during the Imperial Iranian regime during the 1970s.[3] During the Iran–Iraq War the division fought in the Operation Fath ol-Mobin (March 1982),[4] Operation Ramadan (July 1982),[5] Operation Badr (March 1985), and Operation Karbala-6 in early 1987. One of the most famous episodes of the unit, came on May 9, 1982, when 6000 troops of this division were transported from Mashhad to Khuzestan in a single night. This was possible as a result of using the Boeing 747 Iran possessed as a military transport aircraft, setting a new world record in the air transport history. [6]