A-series or A series may refer to:
- A number of 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
- AMD Accelerated Processing Unit, a line of APUs formerly branded as AMD Fusion and produced by AMD
- A small straight-4 automobile engine produced by the Austin Motor Company
- Canon PowerShot A
- Fujifilm FinePix A-series
- Honda A engine
- QI (A series), the first series of the TV quiz show QI
- Series A venture capital financing round for startups
|This disambiguation page lists articles associated with the title A series.
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