Morteza Mahjoobi (Persian: مرتضی محجوبی‎; 1900 – 21 March 1965) was an Iranian pianist and composer.

[3] At the age of ten, Morteza performed a concert accompanying Aref Qazvini in Farus Cinema (Persian: سينماى فاروس‎).

[3] In the following years, he went on to perform with other musicians including Darvish Khan, Seyyed Hossein Taherzadeh (Persian: سيد حسين طاهرزاده‎), and Hossein Esmail Zadeh (Persian: حسين اسماعيل‌زاده‎).

A noteworthy example is his composition "Man az Rooze Azal Divane Boodam" ("I Was Bewildered From Pre-eternity").

[5] While Mahjbi was unfamiliar with western notation, he devised a notation system similar to Siaaq (a set of symbols used in premodern times to note the weight of merchandise or monetary figures), which he used to transcribe musical ideas.