A series

A series may refer to:


 * ISO 216 A series, paper sizes defined by the ISO 216 standard, including A4 paper size
 * A series and B series, two philosophical descriptions of the temporal ordering of events
 * A-series light bulb, the most common type of light bulbs used since the early 20th century
 * BMC A-Series engine, a small straight-4 automobile engine produced by the Austin Motor Company
 * Canon PowerShot A, camera
 * Fujifilm FinePix A series, camera series
 * Honda A engine
 * International A series, pickup truck
 * QI (A series), the first series of the TV quiz show QI
 * Samsung Galaxy A series, a line of mid-range smartphones
 * Series A, venture capital financing round for startups
 * Series A banknotes, Irish banknotes
 * Tool steel A series, air hardened
 * Transperth A-series train, a type of electric multiple unit used by Transperth Trains in Perth, Western Australia
 * Sony Walkman A Series
 * Sony Vaio A series laptops
 * Toshiba Satellite A series laptops