Ser or SER may refer to:
Places Ser, a village in Bogdand Commune, Satu Mare County, Romania Serpens (Ser), an astronomical constellation of the northern hemisphere Serres, known as Ser in Serbian, a city in Macedonia, Greece
Organizations Social-Economic Council (Sociaal-Economische Raad, SER) of the Dutch government Society for Ecological Restoration (SER) Society for Epidemiologic Research, North America
Science and technology Ser (unit), an obsolete unit of volume in India Sequence of events recorder Serine (Ser), an ɑ-amino acid in biochemistry Single-ended recuperative burner, a type of gas burner SIP Express Router Smooth endoplasmic reticulum, in cell biology Soft error rate, in computing Ser., taxonomic author abbreviation of Nicolas Charles Seringe (1776–1858), French physician and botanist
Transport SER, IATA code for Freeman Municipal Airport, Seymour, Indiana, U.S. SER, MRT station abbreviation for Serangoon MRT station, Singapore SER, National Rail code for St Erth railway station in Cornwall, UK South Eastern Railway (England), UK South Eastern Railway zone, India
Other uses SER (magazine), Nicaragua ser, ISO 639-3 language code for Serrano language Cadena SER (SER network), a Spanish radio network Darren Cullen (graffiti artist), a graffiti artist known by the tag name SER Hedva Ser, French artist
See also Serr Sir (disambiguation)