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A materials database is a database used to store experimental, computational, standards, or design data for materials in such a way that they can be retrieved efficiently by humans or computer programs.
Fast access and exchange of materials data between research, design and manufacturing teams working on different sites worldwide, is a challenging issue to be addressed during the product cycle in materials engineering. Another important issue is safeguarding high investments made into materials research, meaning that experimental data must be properly conserved, easily be located and quickly be retrieved. Materials databases (MDBs) are powerful tools to address these problems.
Various categories of MDBs exist for different requirements, for example containing standards data on metallic alloys and plastics or more complex database applications needed for design analysis. MDBs are basic elements for establishing knowledge-based and expert systems.
With the emergence of the Internet, the capability of MDBs increased. Web-enabled MDBs provide a more centralized management and conservation of Materials data. Finding and accessing the required data is faster than to search for them in a traditional manner, e.g. from handbooks or Microsoft Excel files. In particular the dissemination of public research results has improved, as the data are accessible over the World Wide Web. A few web-enabled materials databases exist at present on the market. Examples are:
- Matmatch, which is a free database that can be searched using a range of different filters. It currently has data for over 80,000 materials, a number which is still growing.
- The Materials Project, which maintains a database of calculated materials properties data for over 65,000 materials.
- The Materials Web, which provides databases of computed structures and properties for bulk and 2D materials.
- The Materials databases of NIMS (National Institute for Materials Science) in Japan offers materials data.
- Matweb is a freely accessible online database with technical data sheets for over 69,000 materials.
- IDES provides a free online database with access to 75,000 data sheets on plastics
- Chemical Materials Information Bank(CMiB) of KRICT (Korea Research Institute of Chemical Technology) in Korea is a free online database. 
- Organic Materials Database (OMDB), a free database which hosts over 20,000 large 3-dimensional organic crystals and their calculated electronic band structure and density of states. 
- Materials information for CAD/CAM, Philip Sargent, 1991, ISBN 0-7506-0277-5
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- Materials Project
- Ashton, Michael; Paul, Joshua; Sinnott, Susan B.; Hennig, Richard G. (2017-03-07). "Topology-Scaling Identification of Layered Solids and Stable Exfoliated 2D Materials". Phys. Rev. Lett. 118: 106101. arXiv:1610.07673. Bibcode:2017PhRvL.118j6101A. doi:10.1103/PhysRevLett.118.106101.
- Materials Web
- Materials databases, accessed May 2009
- Mat Web
- Chemical Materials Information Bank(CMiB), since 2007
- Organic Materials Database