# What is a KOL (key opinion leader) in marketing?

> A KOL (key opinion leader) is a person whose expertise or reach in a field shapes the opinions and purchase decisions of others. A KOC (key opinion consumer) reaches fewer people but feels closer to ordinary users.

- URL: https://www.mvpdata.net/en/glossary/kol
- Updated: 2026-09-30
- Also known as: Key opinion leader, 关键意见领袖
- 简体中文: https://www.mvpdata.net/glossary/kol

In Chinese and wider Asian marketing, KOL is the standard word for the people brands work with to reach an audience. The Chinese term is 关键意见领袖 (guānjiàn yìjiàn lǐngxiù). In other fields KOL means something else: in pharmaceuticals it usually means a physician whose views influence other doctors, and in crypto an account that comments on or promotes projects. This entry covers the marketing sense.

The idea of the opinion leader comes from communication research. The two-step flow model, first described in a study of the 1940 US presidential election and developed in the 1955 book *Personal Influence*, held that media messages often reach opinion leaders first and spread from them to everyone else ([Britannica](https://www.britannica.com/topic/two-step-flow-model-of-communication)).

## KOL vs KOC vs KOS: what is the difference?

The difference is who they are and how they influence: a KOL is an expert or high-reach figure, a KOC is a consumer who shares real experience, and a KOS is a salesperson or brand employee who creates content.

| | KOL | KOC | KOS |
|---|---|---|---|
| Stands for | Key opinion leader | Key opinion consumer | Key opinion sales |
| Chinese | 关键意见领袖 | 关键意见消费者 | 关键意见销售 |
| Who | Field experts and high-reach creators | Consumers with some influence over peers | A brand's sales advisers, store staff and product specialists |
| Source of influence | Expertise and recognition | Being like the ordinary user | Product knowledge and one-to-one service |
| Typical use | Awareness, launches, backing a point of view | Word of mouth, reviews, usage posts | Leads, store visits, closing sales |
| Cost pattern | High fee per collaboration | Low cost each, used in numbers | Mainly staff time and internal incentives |

KOC and KOS are industry terms with no official definition; the table reflects common usage in Chinese marketing. KOS accounts are one form of company-owned content, covered under [Brand IP](https://www.mvpdata.net/en/glossary/corporate-ip).

## What is the difference between a KOL and an influencer?

A KOL is defined by authority in a field, an influencer by the size and engagement of a social media audience; the two often overlap but are not the same.

A doctor whose views shape how colleagues treat patients is a KOL without being an influencer. A lifestyle creator with millions of followers is an influencer but is not necessarily treated as an expert in anything. In Chinese marketing, KOL is often used loosely for any creator a brand pays, which is why English-language briefs about China say "KOL" where a Western brief would say "influencer". How an influencer differs from a celebrity, a content creator and a streamer is explained under [Influencer](https://www.mvpdata.net/en/glossary/influencer).

## What is KOL marketing?

KOL marketing is a brand working with KOLs to promote a product or the brand itself, through sponsored content, livestream selling, reviews and usage posts, events and endorsements.

In mainland China it has two legal edges:

- **Endorser duties.** The Advertising Law treats anyone other than the advertiser who recommends or vouches for a product in their own name or image in an advertisement as an advertising endorser (Article 2). Endorsements must be based on fact, and endorsers may not recommend goods they have not used or services they have not received (Article 38).[^1]
- **Labeling.** Under the [Measures for the Administration of Internet Advertising](https://www.gov.cn/zhengce/202305/content_6858084.htm) (Article 9), content that promotes goods or services through knowledge-sharing, experience-sharing or reviews and carries a purchase link must be clearly labeled as an advertisement.

Seen from the KOL's side, the same activity is income; how disclosure rules compare between the US and China is covered under [Creator monetization](https://www.mvpdata.net/en/glossary/ip-commercialization).

## Further reading

- How brands find creators across the China–North America border: [Cross-border influencer marketing](https://www.mvpdata.net/en/brands/influencer-marketing)
- How established creators and public figures get brand deals: [Partnerships & opportunities](https://www.mvpdata.net/en/services/partnerships)
- Posts that make people want to buy: [Zhongcao (seeding)](https://www.mvpdata.net/en/glossary/zhongcao)
- Executive and sales-staff accounts inside a company: [Companies & brands](https://www.mvpdata.net/en/ip/corporate)

## Related terms

- [What is an influencer (wanghong)?](https://www.mvpdata.net/en/glossary/influencer): An influencer is a person who has gained a large online audience through content, livestreams or online events and can sway its views or purchases. Influence measures reach; a personal brand measures lasting trust, and not every influencer has one.
- [What is a head influencer?](https://www.mvpdata.net/en/glossary/top-ip): A head influencer is a creator or public figure whose influence and commercial value rank at the head of their field or platform, in the Chinese industry's head, waist and tail tiers. Unlike "mega influencer", usually meaning one million-plus followers, the head tier is relative, not a follower count.
- [What is creator monetization (IP commercialization)?](https://www.mvpdata.net/en/glossary/ip-commercialization): Creator monetization is converting the attention and trust a creator or public figure has built into income: brand deals, endorsements, livestream selling, licensing and owned products. It is broader than platform programs such as the YouTube Partner Program.
- [What is brand IP (corporate IP)?](https://www.mvpdata.net/en/glossary/corporate-ip): Brand IP, also called corporate IP, is a personified company asset, such as a founder, a character or a content series, that audiences follow over time. A brand is an identity and promise; brand IP is how it gets told.
- [What is an MCN (multi-channel network)?](https://www.mvpdata.net/en/glossary/mcn): An MCN (multi-channel network) is a company that works with many creators or channels, providing content, operations and monetization services for a share of revenue. The term began on YouTube; in China, MCNs usually sign creators to management contracts.

[^1]: 《中华人民共和国广告法》 (Advertising Law of the People’s Republic of China), Standing Committee of the National People’s Congress. Published 2021-04-29. https://www.samr.gov.cn/zw/zfxxgk/fdzdgknr/fgs/art/2023/art_5474cf75173c45d6a0379730fb4e8d97.html (Checked 2026-10-17, Unofficial translation)