Nilore (Urdu: نیلور) is a townsite-city in the Islamabad Capital Territory of Pakistan, located and established in the district limit of Islamabad. The city is located around 25 kilometers south-east of Islamabad, and controlled under the Islamabad Police to ensure the law and justice in the city.

The Pakistan Institute of Nuclear Science & Technology (PINSTECH), covering around 400 acres, and the Pakistan Institute of Engineering & Applied Sciences (PIEAS) are located in Nilore, where key nuclear research takes place.

Nilore was established in 1967 as a research site for nuclear technology. It became a secret city and became one of the major research site for the integrated nuclear development to develop the atom bomb in the 1970s. It was closed to the public in the 1970s by the Ministry of Defence, and starting in 1972, the Pakistan Army Corps of Engineers acquired the entire city and immediately removed the local residents as they were paid heavy compensation.

By 1973, the city communities had been removed, and fences and checkpoints had been established. Its relatively low population made acquisition affordable for the Ministry of Defence and the city was re-constructed by the Corps of Engineers. Facilities and institutes were expanded and new houses, homes, and facilities were built for the scientists and engineers who began their government research under extreme secrecy.

Since then, Nilore's given nicknames include "Northern atomic city", "secret valley" and the "city behind the fence". Nilore hosted an apex scientific research in the 1960s led under Abdus Salam, and the scientific research and development still plays a crucial role in the city's economy and culture in general.

Since the 1990s, the city has been opened for the public and classified facilities were immediately closed by the government and re-located at unknown locations.

PIEAS is one of the finest institution in Pakistan. It was ranked amongst the Top 400 in the QS World University Rankings 2023. It has been producing engineers for Pakistan for many decades. Students who are interested in studying in a beautiful and lovely location than PIEAS is amongst the best option. PIEAS is a better and an affordable option. It also provides various scholarship programs.