Nordic berries, such as bilberry (Vaccinium myrtillus), lingonberry (V. vitis-idaea), cloudberry (Rubus chamaemorus), and sea buckthorn (Hippophae rhamnoides), are exceptionally rich in phytochemicals such as anthocyanins, flavan-3-ols, flavonols, and ellagitannins. These phytochemicals exert anti-inflammatory, lipid-modulating, and neuroprotective effects that have the potential to mitigate chronic diseases, including type 2 diabetes (T2D), obesity, cardiovascular diseases (CVD), cancer, and neurodegenerative disorders. Evidence from randomised controlled trials (RCTs), cohort studies, and experimental models conducted during the years 1999-2025 indicate that Nordic berries improve glycaemic control, lower low-density lipoprotein-cholesterol (LDL-C), reduce C-reactive protein, and modulate gut microbiota composition. Herein, a typical effective intake in human studies with 50-400g fresh berries per day yielded reductions in fasting glucose, LDL-C, and systolic blood pressure. Animal models corroborate these effects through activation of AMPK, inhibition of NF-κB, and enhancement of endothelial nitric oxide production. Further, preliminary cancer and neurodegenerative disorder data are promising yet remain preclinical or limited to short-term studies. This narrative review integrates primary evidence on the health impacts of Nordic berries, identifies knowledge gaps, and outlines future research directions to substantiate their role in chronic-disease prevention and management.