Jaso or JASO may refer to:
*
Jaso State, a princely state in British India
*
Japanese Automotive Standards Organization (JASO), an organization that sets automotive standards in Japan
** JASO T904, a quality classification standard of four stroke motor oils - it contains JASO T904-MA, JASO T904-MA2 and JASO T904-MB; see
Motor oil#JASO
**
JASO M345, a quality classification standard of two stroke motor oils – it contains JASO FA, JASO FB, JASO FC and JASO FD
* ''
Journal of the Anthropological Society of Oxford'', an academic anthropology journal
People with the surname
*
John Jaso, American former baseball player.
{{disambiguation, surname