A lost Indian passport is an inconvenience - it will disrupt travel plans, and require applying for a replacement passport, which will take time and money. You will need to fill out forms and gather the appropriate documents and photographs. You must pay a minimum of 2500 rupees (depending on the time frame you're looking at). The Indian government has made it a relatively smooth process and, once the application is submitted, the passport could be issued in one day.
Go to the Indian government's passport website and fill out form number one for replacing lost or damaged passports, new and reissued passports. Attach the three required colour photographs.
Decide which method you would like to use to apply for your passport. The Indian passport website lists four ways to apply: through a passport office, district passport cells, speed post centres or passport application collection centres.
Collect all required documents (proof of address, proof of date of birth and citizenship document), photos and completed forms and submit them along with the fee. The fee to replace a lost or damaged Indian passport is 2500 rupees.
Wait for your passport to come by postal mail. The wait will vary depending on what kind of passport service you applied for and how many other applications were received before yours.
The Indian government does offer a service to expedite the process of replacing a lost Indian passport. The service is called the Tatkaal Scheme and will cost 2500 rupees in addition to the 2500 rupees needed to replace the passport. You will get your passport within 1-7 days or you can pay 1500 rupees to get it within 8-14 days. There may be additional or different forms associated with replacing a lost Indian passport through Tatkaal Scheme, and you should read through the Tatkaal Scheme information to ensure you submit the right information.