不空羂索观音(梵名Amogha-pasa)，全称为不空羂索观世音菩萨，又称不空王观世音菩萨、不空广大明王观世音菩萨、不空悉地王观世音菩萨、不空羂索菩萨。密号为等引金刚。以“不空羂索”为名，是象征观世音菩萨以慈悲的羂索，救度化导众生，其心愿不会落空的意思。

Padmapani (lotus holder) is a Sanskrit term referring to Lokeshvara, the bodhisattva, having one face and two hands. The left hand holds the stem of a blossoming lotus flower. The textual inspiration for the imagery of Lokeshvara in this appearance are the Sutras of the Mahayana (大乘佛教) tradition of Buddhism. Padmapani is also used as a synonym for Lokeshvara. The term is commonly found as an epithet, as well as a descriptive term, referring to the lotus held in the left hand. It has yet to be shown or proven textually that there is any specific and unique form of Lokeshvara accepted across the Indian Buddhist cultural sphere that is described in early literature as a Padmapani Avalokiteshvara.

观音菩萨

不空羂索观音典型形像为，首戴化佛宝冠，一面四臂，面目熙怡。左右上手执莲花瓶、把数珠，下手施无畏印。或为一面三目，执莲花、三叉戟、把羂索、 施无畏印。披鹿皮衣结跏趺坐，璎珞珠钏庄严诸天衣。诸变化身有三面十八臂、三面六臂、一面四臂等。今传世诸像以三面六臂为多。敦煌壁绢画中也有不少作品， 而日本所传多以一面八臂为标准。