The "obvious" one: The 1971 Indo-Pakistan war, which brought about regime change in East Pakistan/Bangladesh.
In 1971, following a devastating typhoon, rebels in what is now Bangladesh began an independence campaign. The Government, based in "West" Pakistan responded violently and a quite brutal civil war ensued.
It the end of 1971, and following attacks from West Pakistan on India, India began a full-scale military operation in support of the rebels. This resulted in the defeat of the Pakistani government in Bangladesh, and the creation of a new Bangladeshi government in that region.
The actions of India in the Indo-Pakistan war were clearly intended to breakbring about regime change in East Pakistan.