Ideological bias on Wikipedia

Ideological bias on Wikipedia, especially in its English-language edition, has been the subject of academic analysis and public criticism of the project. Questions relate to whether its content is biased due to the political, religious, or other ideologies its volunteer editors may adhere to. These all draw concerns as to the possible effects this may have on the encyclopedia's reliability.^[1][2]

Wikipedia has an internal policy which states that articles must be written from a neutral point of view, which means representing fairly, proportionately, and, as far as possible, without editorial bias, all of the significant points of view that have been verifiably published by reliable sources on a topic.^[3]

Collectively, findings show that Wikipedia articles edited by large numbers of editors with opposing ideological views are at least as neutral as other similar sources, but articles with smaller edit volumes by fewer—or more ideologically homogeneous—contributors are more likely to reflect an editorial bias.^[4][5] Multiple studies, including two from the same Harvard researchers, found a left-wing bias at Wikipedia in both article content and editor sanctioning.^[6][7]