Acute respiratory tract infections are the most common diseases in all individuals, regardless of age or sex. Epidemiological research and community-based studies conducted since the early 20th century have determined the rates of disease and the pathogens involved in such infections. More recently, advances in diagnostic techniques have enabled a more complete identification of the viruses involved in respiratory infections, which has aided in the ability to target specific therapeutic agents to the causative pathogens. Natural products have been used since earliest times as a treatment for various diseases. In this review, we show that natural products derived from plants and seaweed present promising results for several respiratory viruses such as human metapneumovirus (HPMV), Influenza, Respiratory Syncytial Virus (RSV), Rhinovirus, Paramyxovirus, Hantavirus, Adenovirus, Feline, Murine and other Human Coronaviruses, in addition to new therapeutic perspectives against COVID-19.