Official logo of the Vietnamese Wikipedia from September 25, 2009, to 2010. The Vietnamese Wikipedia community agreed to replace File:Wikipedia-logo-vi, 2005-2009.png with this logo to address the antialiasing issue prominent on namespaces other than the main namespace. It was subsequently replaced by File:Wikipedia-logo-v2-vi.svg.

The wordmark and tagline Bách khoa toàn thư mở (“open encyclopedia”) are all set in Hoefler Text (with the tagline at 13 pt); however, the hook and horn diacritics were drawn by hand, since Hoefler does not completely support Vietnamese. The k in the tagline has a descender swash; this variant is available as an option in Hoefler Text. A detailed description of the logo, as well as instructions for "doodling" it, are available in Vietnamese.

In the past, the project used a version by Nohat that bore the tagline Bách khoa tự do (roughly, “free encyclopedia”). The project's original logo was used only briefly before being replaced for aesthetic reasons. Before that, the Vietnamese Wikipedia simply used the English Wikipedia logo; see that logo's history.