The Documents required to apply for a Portuguese Citizenship.

For those born in Goa before 19th December 1961:

List of documents:

• Birth Certificate / Birth Teor of applicant ( Birth Certificate in Portuguese)
• Document of Identification – Indian Passport along with Aadhaar Card or Election Card/ Voters Card or Driving License or ID card from the country you're in
  
• Death Certificate (If the applicant is deceased)
• Birth Certificate / Birth Teor and Marriage Certificate / Marriage Teor of the applicant’s parents
• Certificate of Residency with full address and photograph, indicating residency between January 1974 and December 1975

For those born after 1961:

It will be necessary to prove that your parents or grandparents were born in Goa and got married there before 1961.

• Assento de Nascimento and Assento de Casamento (photocopy) of the applicant’s parent.(Assento de Nascimento is the birth certificate issued by Conservatoria dos Registos Centrais in Lisbon, Portugal & Assento de Casamento is the marriage certificate issued by the Conservatoria do Registo Civil in Lisbon, Portugal. Both these certificates can be obtained on completion of Registration of birth and marriage of one of the Parent in Portugal)
• Legal Identification Documents (current passport). Valid Indian Passport. Other identity cards include Aadhaar Card or Election Card/ Voters Card or Driving License or ID card from the country you're in
• Certificate of Residency with full address and photograph
• Certificate of Residency indicating residency between January 1974 and December 1975
  

For marriage registration in Portugal:

List of documents:

• Assento de Nascimento (photocopy) of the applicant (Assento de Nascimento is the birth certificate issued by Conservatoria dos Registos Centrais in Lisbon, Portugal. This certificate can be obtained only on completion of Registration of birth in the Conservatoria de Registos Centrais)
• Marriage Certificate of the applicant
• Birth Certificate of the spouse
• Document of Identification – Indian Passport along with Aadhaar Card or Election Card or Driving License of the spouse
  
• Death Certificate of spouse (If spouse is deceased)

List of documents:

• Assento de Casamento (photocopy) of the couple. (Assento de Casamento is the marriage certificate issued by the Conservatoria do Registo Civil in Lisbon, Portugal)
• Assento de Nascimento (photocopy) of Portuguese spouse. (Assento de Nascimento is the birth certificate issued by Conservatoria dos Registos Centrais in Lisbon, Portugal)
• Birth Certificate of the Applicant (Non-Portuguese National)
• Document of Identification – Indian Passport along with Aadhaar Card or Election Card/ Voters Card or Driving License or ID card from the country you're in
  
• Police Clearance Certificate
• Two witnesses preferably Portuguese Nationals who are of applicant’s age or above