Citizens of most countries require valid visa to enter the Qatar. The Consulate General determines the duration of visa upon receiving an application.
Tourist Visa
Qatar tourist visas can be obtained on arrival by visitors coming from the following countries: Vatican City, Andorra, UK, Australia, USA, Austria, The Netherlands, Belgium, Brunei, Switzerland, Canada, South Korea, Denmark, Singapore,  France, Finland, Greece, Germany, Ireland, Hong Kong, Iceland, Italy,  Liechtenstein, Japan, Luxemburg,  Monaco, New Zealand, Norway, Malaysia, Portugal, Spain, San Marino,  and Sweden for a cost of 100 riyals. The Qatar tourist visa’s validity is 2 weeks and is extendable for a further week.
Accepted payments methods:
–        Visa.
–        E-cash.
–        Maestro.
–        MasterCard.
–        Visa-electron.
Paying for your visa can be performed at the immigration desk. In order to be granted access, you have to have a relative in Qatar or a booking in a hotel.
Before applying for a tourist visa, make sure that you have 5000 riyals in a bank account or a credit card. You should also possess the relatives/friends you’re staying with address.
Business Visa
If you have one of the countries above citizenship and work for a (or will work for) Qatari company, then you’re eligible for a Qatar business visa. The company is the one responsible for organizing business visas for its workers. This type of visas’ validity is 2 week extendable to 2 other weeks (or more, it depends on the circumstances). If your stay in Qatar surpassed 4 weeks on a business visa, you’ll need an exit visa in order to leave.