DB, dB, or db may refer to:
DB Cargo UK, formerly DB Schenker Rail UK and English, Welsh & Scottish Railway, is a British rail freight company headquartered in Doncaster, England.
dBase (also stylized dBASE) was one of the first database management systems for microcomputers, and the most successful in its day.
DBS Bank Ltd is a Singaporean multinational banking and financial services corporation headquartered in Marina Bay, Singapore.
DB Class V 200.0 (from 1968: Class 220) was the first series production diesel-hydraulic express locomotive of the German Deutsche Bundesbahn and - as Am 4/4 - of the SBB-CFF-FFS in Switzerland.
Density-based spatial clustering of applications with noise (DBSCAN) is a data clustering algorithm proposed by Martin Ester, Hans-Peter Kriegel, Jörg Sander and Xiaowei Xu in 1996. It is a density-based clustering algorithm: given a set of points in some space, it groups together points that are closely packed together (points with many nearby neighbors), marking as outliers points that lie alone in low-density regions (whose nearest neighbors are too far away).
DBpedia (from "DB" for "database") is a project aiming to extract structured content from the information created in the Wikipedia project.
db4o (database for objects) was an embeddable open source object database for Java and .NET developers.
The DB Class 628 is a twin-car, diesel multiple unit operated by the Deutsche Bahn AG for local passenger rail services.
The Single Nucleotide Polymorphism Database (dbSNP) is a free public archive for genetic variation within and across different species developed and hosted by the National Center for Biotechnology Information (NCBI) in collaboration with the National Human Genome Research Institute (NHGRI).