Aftermarket may refer to:
- Aftermarket (merchandise), any market where customers who buy one product or service are likely to buy a related, follow-on product
- Aftermarket (automotive), the addition of non-factory parts, accessories and upgrades to a motor vehicle also to include removal of parts after vehicle is placed on market
- Aftermarket (finance), or secondary market in financial parlance, the trading of securities that have already been issued
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