Will I still owe Indian tax if I move abroad before selling my shares?

It hinges on your residential status in the year you sell, which is a tax concept, not just where you hold a passport. If you qualify as a resident in India that year, your worldwide gains are taxable here. If you become a non resident, India generally still taxes gains that arise from Indian assets, such as shares in an Indian company, so relocating does not simply switch off the tax on your startup equity. The country you move to may also tax the same gain, and India's tax treaties decide who gets to tax what and how you avoid being taxed twice. The timing of your move relative to the sale, and the day count that fixes your status, can materially change the outcome. This is complex and personal, so plan it with a cross border tax specialist and treat this as education, not advice.