Qatar Chemical Company Ltd. (Q-Chem) is a Qatari company owned by Qatar Petroleum (QP) and Chevron Phillips Chemical International Qatar Holdings LLC (CPCIQ).

QP owns 51 percent of Q-Chem and CPCIQ owns 49 percent. The Q-Chem facility is a world-class integrated petrochemical plant capable of producing high-density and medium-density polyethylene (HDPE & MDPE), 1-hexene and other products, using state-of-the-art technology provided by Chevron Phillips Chemical, a major integrated producer of chemicals and plastics.

Over US $1 billion was invested to engineer, construct and commission the Q-Chem facility, which began operations in late 2002.

The Q-Chem complex in Mesaieed Industrial City is comprised of an ethylene unit (capable of producing 500,000 metric tons per annum (mtpa)), a polyethylene facility (capable of 453,000 mtpa), and a 1-hexene unit (capable of 47,000 mtpa). Q-Chem assets also include a sulfur recovery and solidification unit, a bagging and storage warehouse, a nitrogen unit, a water treatment plant, seawater cooling system, dock facilities and various administrative buildings.