8. Is there a ban on anonymous donations to candidates?

"Section 56       No person not being of Thai nationality shall support an election campaign or commit any act for the benefit of an election in a manner favorable or unfavorable to any candidate or political party except when such act is committed to support a government service or committed honestly in an ordinary course of business of such person.

Section 57       No State official shall, by exercising the function unlawfully, commit any act to be favorable or unfavorable to a candidate or a political party."

Source: Sections 56-57, Organic Act on Election of Members of the House of Representatives and Installation of Senators, 2007

Only a ban on donations from foreign nationals.