Turkish police fired tear gas at protesters gathered for an LGBT pride march banned for the fifth year in a row.
The activists had gathered in Istanbul to promote rights for gay and transgender people.
The rally on a side street to Istanbuls main pedestrian avenue drew at least several hundred people on Sunday, who cheered and waved rainbow flags.
Istanbul Pride organisers said the citys governors office banned the march from central Taksim district as well as a square designated for demonstrations west of the city.
Police allowed representatives to make a short statement to the media before officers dispersed the crowd with tear gas, blocking the street. Police dogs were also at the scene.
The Istanbul Pride group said it would continue activism to get sexual orientation and gender identity recognised in Turkish laws.
Amnesty International had urged Turkey to lift the arbitrary ban on the pride march.
It said authorities rejected all suggested locations in the city by deeming the LGBT community societally objectionable.
Istanbul had up to 100,000 people attend a pride march in 2014 but police have blocked such marches since.