Like most countries in Central and South American, United States citizens entering Peru do not need to apply for a special visa. Upon arriving in the country, the stamp in your passport is used as your entrance into the country, and is valid for a period of 90 days. Extensions can be obtained for US $20 per additional month, plus an administration fee of about 30 soles. You are limited to an additional 180 days, but may cross the border into any neighboring country an re-enter.
If you are traveling for business purposes you will need to apply for a special visa, which you can get here. You will also need a 2×2 photograph, a valid US p
assport, and a letter from your employer to the Embassy of Peru, Visa Section, Washington D.C. that explains the purpose of your travel and guarantees your financial status in the country. It needs to be signed by a company officer other than the applicant.
More questions? Check out the Peruvian Embassy web site for additional information.

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