The Government of Uganda has introduced the online visa application system with effect from 01 July 2016.
All persons intending to come to Uganda for holiday, tourism, business, study, visit, medical are required to apply and obtain a visa online. Applications should be filled at the following link:

https://visas.immigration.go.ug/.
The decision taken on the application will be sent electronically through the email provided by the applicant. If approved, an approval letter will be sent as an attachment to the email provided. Print it out and present it together with a valid passport / travel document at the port of entry.

Information about documents required in the online visa application is found here: https://visas.immigration.go.ug/#/help/visa

Types of Visa
1. Multiple-Entry
2. Diplomatic and Official
3. Ordinary
4. East Africa Tourist Visa (multiple entry valid for 90 days to Uganda, Kenya and Rwanda)
5. Transit

Through the month of July 2016, it will still be possible to get visas on arrival. However, the traveler will have to go through the electronic application process (as above) at the port of entry. This will only apply in the month of July 2016, after which all visa applications shall be online.