Institut Jantung Negara Sdn Bhd (also known as National Heart Institute; abbreviation IJN), is a heart surgery centre in Jalan Tun Razak, Kuala Lumpur, Malaysia.

IJN was founded in 1992 under Prime Minister Mahathir Mohamad tenure.

The IJN was first established in 1984 by a few cardiologists and general physicians and was situated at the GHKL's old blood bank office, and the current IJN's logo was created in the same year of 1984.

The institutes specialises in cardiology and cardiothoracic surgery services for both adult and paediatric cases.

As the national referral centre for cardiovascular disease, IJN sees new cases referred from all over the country and abroad and follow-up cases at the outpatient clinics.