Ivan Lam Long-yin, 29, is a Hong Kong political activist who, together with Joshua Wong, established the Hong Kong student activist group, Scholarism, in May 2011. In 2018, he replaced Nathan Law as the chairperson of Demosisto. In December 2020, Lam was sentenced to seven months in prison for his role during the 2019 protests. Along with him, activists Joshua Wong and Agnes Chow were also convicted. On 12 April 2021, he was released from prison.
On 5 July 2023, Lam was again arrested, along with three others, according to local media. The group was suspected to have provided financial aid to self-exiled activists, and to have published seditious material on social media.