比奥纳兹（法语：Bionaz），是意大利瓦莱达奥斯塔的一个市镇。总面积140平方公里，人口237人，人口密度1.7人/平方公里（2009年）。ISTAT代码为007010。

Bionaz (known during the years 1939–46 as Biona) is a comune sparso which extends over 143 square kilometres (55 sq mi) of the North-Eastern Valpelline area of the Aosta Valley region of northwest Italy. The commune lies on the left side of the river Dora Baltea. The population of about 240 is dispersed among 20 or more small alpine villages and hamlets including Plan-de-Veyne, which is the main centre and the capoluogo (locally and officially also chef-lieu, in French). The commune belongs to the Unité des communes valdôtaines du Grand-Combin.