Laboratório Marítimo da Guia – LMG (Guia Marine Laboratory) is a state-of-the-art research facility located in Cascais, on the Atlantic coast, uniquely positioned for cutting-edge marine science. Operated by MARE - ULisboa, LMG provides direct access to coastal environments and is equipped with advanced infrastructure tailored to multidisciplinary marine research.

The facility offers both open and closed aquarium systems within life support systems, including temperature, pH, CO₂, oxygen, light, and salinity control by an aquarium computer. Researchers benefit from climate and light-controlled rooms, as well as dedicated marine culture rooms for zooplankton, phytoplankton, fish, and invertebrates. Natural seawater, filtered and UV-radiated, is continuously available, supporting experimental rigour and long-term studies.

The infrastructure also includes a biochemistry lab and a dedicated machine learning workstation lab to support high-throughput data analysis and AI applications in marine science. Complementing its land-based assets, LMG has access to diving and boat operations through a strategic partnership with Clube Naval de Cascais, enabling seamless integration of field and laboratory research.