Expatriate dissidents and students staged small-scale vigils and protests in cities around the world including London, Paris, Tokyo and Sydney, according to a Reuters tally.
In most cases, dozens of people attended the protests, though a few drew more than 100, the tally showed.
The protests on the mainland were triggered by a fire in China's Xinjiang region last week that killed 10 people who were trapped in their apartments.
On Monday evening, dozens of protesters gathered in Hong Kong's Central business district, the scene of sometimes-violent anti-government demonstrations in 2019.
BLAME, SLOGANSIt has been common in recent years for overseas Chinese students to rally in support of their government against its critics, but anti-government protests have been rare.