Siung or Siyung () is a traditional lightweight headgear from Sabah, Malaysia, once commonly worn by the Kadazan females of the Papar District for protection against sunlight and rain during their agricultural activities. In present days, the siung are more seen during the sazau or sumazau cultural performances and the harvest festival of the Kaamatan.
The siung is considered as the symbol of Papar Kadazans female that distinguished them from the Penampang Kadazans. It is made of finely wovenÃÂ bambooÃÂ strips andÃÂ rattanÃÂ with aÃÂ featherÃÂ symbolising that the KadazanÃÂ 'ÃÂ are still unmarried; the flower one means already married, while plain either means widowed, a grandmother or elderly. Another hint is the silver belt (antique British trade dollar); unmarried Kadazan females usually have four, while those married wear only two. The siung is paired with black velvety fabric of sia with gold weave designs and a belt called ikat pinggang and dastar headdress with the same fabric.
Siung once featured in the sets of Malaysian stamps of RM1 in the year of 2006.