Mikkola also claimed his home 1,000 Lakes event on a record seven occasions.
“We lost my father Hannu to cancer this weekend. Most knew him as a rallying great who ushered in the golden years of the sport,” said his son Vesa.
The 2003 world champion Petter Solberg was among those to pay tribute.
“Really sad to hear the news about Hannu Mikkola – he was a legend, a proper gentleman, a real champion, and a great father to great kids. Sending all my condolences to his family and friends. RIP,” he said on Twitter.