| Isar-ul-Haq Qasmi | |
| Religion: | Islam |
| Birth Date: | 1964 |
| Birth Place: | Samundri, Punjab, Pakistan |
| Office1: | Chief of the Sipah-e-Sahaba |
| Term Start1: | 1990 |
| Term End1: | 1991 |
| Predecessor1: | Haq Nawaz Jhangvi |
| Successor1: | Zia ur Rehman Farooqi |
| Office2: | Member of National Assembly of Pakistan |
| Term Start2: | 1990 |
| Term End2: | 1991 |
| Predecessor2: | Sayeda Abida Hussain |
| Successor2: | Azam Tariq |
| Death Cause: | Assassination |
Isar-ul-Haq Qasmi (; died 1991) was a Pakistani Islamic cleric, preacher and a member of Sipah-e-Sahaba. He had been member of the National Assembly of Pakistan between 1990 and 1993 representing Jhang constituency.
Born in 1964 to a family which migrated from Ambala and settled in Samundri, Punjab, at the Partition, with a father who worked in the Middle East for years (like many SSP members), he was educated in three madrasas in Lahore, and at first went for a business career but then decided to become khatib (preacher) in an Okara mosque from 1985 onward, where he also established a madrasa, and he would soon gain a reputation for his clashes with the local police, before moving to Jhang at the request of Haq Nawaz Jhangvi, to preach in one of the market-towns of the district.[1]
His family was Punjabi Rajput.[2]
He was elected to the National Assembly of Pakistan as a candidate of Islami Jamhoori Ittehad (IJI) in the 1990 Pakistani general election.[3] He received 62,486 and defeated Nawab Amanullah Khan Sial of the Pakistan Democratic Alliance (PDA).
He was killed in 1991 during a by-election in Jhang.[4]