To gain entry into Tanzania, US citizens, and most other nationalities will need a passport and visa. The passport must be valid for 6 months after the intended length of stay.

Visas can be obtained prior to departure from the USA (recommended due to long wait times at JRO) or at your point of entry into Tanzania. The visa cost for US citizens is $100. More information can be found here: http://tanzaniaembassy-us.org/?page_id=76#visaForms
?page_id=76#visaForms

Visa at JRO

JRO Visa Windows

Obtaining a Visa at JRO airport for citizens of most countries is a relatively simple process. When you arrive at JRO, there will be two lines. The line on the right is for people purchasing a visa. The line straight ahead is for people who have a visa.

To get your visa you fill out the required form and get in line for the first window. Give them the form and show them your passport. Go to the line for window two. Pay for the visa and get your photo taken. Go to the line for the third window and receive your visa.