The phenomenon of Urban Heat Islands (UHIs) represents one of the most significant complex environmental challenges threatening the quality of life and sustainability of urban centers in Iraq. This phenomenon is reflected in the noticeably higher temperatures recorded in densely populated urban areas compared with rural areas and the surrounding agricultural environment (Oke et al., 2017). In light of the increasing temperatures and changing climatic conditions witnessed in Iraq, this phenomenon is no longer merely a natural climatic variation. Rather, it has become an environmental, health, and economic challenge affecting Baghdad and various Iraqi governorates, including Babil, Basra, and Nineveh (Al-Mqdadi et al., 2021). Causes of Urban Heat Island Formation in the Iraqi Urban Environment A combination of human and engineering factors contributes to the formation of permanent heat hotspots within Iraqi cities, the most important of which include: 1. Decline in Vegetation Cover and Removal of Orchards Over recent decades, there has been a significant decline in green belts and historical orchards that once served as natural barriers and cooling systems for cities, such as the orchards of Al-Dora and Al-Mahmoudiyah in Baghdad, the palm groves in Shatt Al-Arab in Basra, and the agricultural areas surrounding the city of Hillah in Babil (Hassan & Al-Musa, 2020). The conversion of these lands into unplanned residential areas and concrete developments has resulted in the loss of natural cooling mechanisms based on evaporation and plant transpiration (Evapotranspiration). 2. Physical Characteristics of Urban Construction Materials Modern architectural and construction practices in Iraq rely extensively on reinforced concrete and dark asphalt. These materials have high thermal capacity and low solar reflectance (Low Albedo), allowing them to absorb intense solar radiation throughout the day and store it, then release the accumulated heat during nighttime hours. This reduces the ability of cities to benefit from natural nighttime cooling (Akbari et al., 2016). 3. Direct Anthropogenic Heat High traffic density, widespread reliance on thousands of privately operated diesel generators distributed throughout residential neighborhoods to compensate for electricity shortages, as well as thermal emissions from residential and industrial air-conditioning systems, all contribute to releasing large amounts of direct heat into the lower layer of the urban atmosphere (Santamouris, 2020). Environmental, Health, and Economic Impacts The worsening of urban heat islands in Iraqi cities has resulted in a number of serious challenges, most notably: Excessive Pressure on Power Networks: Continuous increases in temperature lead to unprecedented peaks in electricity consumption for cooling purposes, increasing the load on an already strained power network and contributing to frequent power outages (Al-Gburi, 2022). Health Risks and Deterioration of Air Quality: High temperatures increase the incidence of heat stress and heatstroke and aggravate respiratory and cardiovascular conditions among vulnerable groups. High temperatures can also accelerate reactions involving vehicle emissions, contributing to the formation of harmful secondary pollutants such as ground-level ozone and fine particulate matter (Kottek et al., 2019). Local Climate Change: This phenomenon contributes to disturbances in the local thermal and hydrological balance, reducing opportunities for beneficial moisture formation and increasing the severity of urban drought (Al-Timimi & Al-Jiboori, 2018). Mitigation Strategies and Sustainable Urban Planning Reducing the intensity of urban heat islands in Iraq requires the adoption of integrated engineering and environmental strategies based on Nature-based Solutions, including:Revitalizing and Developing Green Infrastructure: Expanding public parks, planting drought-resistant native trees that require limited amounts of water, such as sidr, karat, and willow, and requiring new residential complexes to allocate specific proportions of their areas to green spaces (Gartland, 2012). Applying Cool Building Materials: Encouraging the use of high-reflectance coatings on rooftops (Cool Roofs) and lighter-colored asphalt materials to reduce heat absorption (Santamouris, 2020). Bioclimatic Architectural Design: Reorganizing the architectural orientation of buildings to ensure the creation of wind corridors (Wind Corridors) that contribute to renewing urban air and naturally cooling cities (Oke et al., 2017). Urban Water Resource Management: Protecting and developing the banks of rivers and water channels, such as the Tigris and Euphrates rivers and Shatt Al-Hillah, and utilizing them as natural cooling areas through evaporation (Al-Mqdadi et al., 2021). Conclusion The phenomenon of urban heat islands in Iraq represents an environmental challenge that requires urgent intervention by planning, academic, and service authorities. Moving toward sustainable urban planning and restoring the green ecological dimension of cities is not a luxury but an essential necessity for protecting public health, achieving environmental sustainability, and ensuring that Iraqi cities remain suitable for living amid accelerating climate change. Ammar Badri Al Mustaqbal University The First University in Iraq