If your PAN card is lost then you can apply for duplicate PAN card. You will have to submit a Form named, “Request for New PAN Card, or, and Changes or Correction, in PAN Data." You can also submit a copy of FIR along with the form. If the PAN card is lost and you don't remember your PAN, then in such a case, you can know your PAN by using the facility of "Know Your PAN" provided by the Income Tax Department. This facility can be availed of from the website of Income Tax Department which is www.incometaxindia.gov.in. You can know your PAN online by providing the details like your name, your father's name and your date of birth. After knowing the PAN you can apply for duplicate PAN card by submitting the Form named, "Request For New PAN Card, Or, And Changes Or Correction, in PAN Data".