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Nielsen may refer to:
- Nielsen Holdings N.V. (after Arthur Nielsen), a Dutch media conglomerate (formerly VNU); parent company of:
- ACNielsen, a marketing research firm
- Nielsen Media Research, the company that creates the Nielsen Ratings
- Nielsen Broadcast Data Systems, a service also known as BDS that tracks monitored radio, television and internet airplay of songs
- Nielsen Norman Group, a computer user interface and user experience consulting firm
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