UOB Kay Hian Holdings Limited (Chinese: 大华继显控股有限公司; pinyin: Dàhuá Jì Xiǎn Kònggǔ Yǒuxiàn Gōngsī) is a Singapore-based brokerage firm that engages in brokerage services, private wealth management, investment management and financial research.

On 27 September 2000, United Overseas Bank Securities Pte Ltd's and Kay Hian's shareholders approved the merger of both companies.

On 31 August 2022, UOB Kay Hian was fined S$375,000 by the Monetary Authority of Singapore (MAS) for failing to comply with business conduct requirements under the Securities and Futures (Licensing and Conduct of Business) Regulations, as well as anti-money laundering and countering the financing of terrorism requirements listed by the MAS.

[10] UOB Kay Hian failed to detect and report suspicious transactions despite red flags of potential nominee arrangements, which may be abused to conceal beneficial ownerships and facilitate market misconduct.

UOB Kay Hian also failed to verify customers' source of wealth, even though they were determined by the firm to be of higher money laundering risk.