"Dr. Ahmed Kathrada will be remembered as a remarkable personality, whose life was devoted to creating a just & equal society. RIP," he tweeted.
"I was honoured to have interacted with an inspiring personality like Dr. Ahmed Kathrada during my South Africa visit last year," said Modi while recalling his meeting.
Along with the tweet, Modi posted a photograph in which both are seen together.
Kathrada, 87, died after complications following a brain surgery, his foundation said.
Disclaimer: No Business Standard Journalist was involved in creation of this content