Longkan Shoujian (龍龕手鑒, literally The Handy Mirror in the Dragon Shrine) is a Chinese dictionary compiled during the Liao Dynasty by the Khitan monk Xingjun. Completed in 997, the work had originally been entitled Longkan Shoujing (; and are synonyms), but had its title changed owing to naming taboo when it was later printed by the Song publishers. (Emperor Taizu's grandfather had the name , a homophone of .) The earliest surviving edition of the work is an incomplete Korean one, reprinted in China in 1985.

Longkan Shoujian was one of the many Buddhist yinyishu (; 'dictionary of pronunciations and meanings') produced in ancient China, which were meant to aid the study of Buddhist scriptures. However, the work stands out in two aspects. Firstly, its method of collation is innovative. While Chinese dictionaries before Shoujian collate characters either graphically (by radical) or phonetically (by tone and rime), the work employs both methods: the radicals, which number 242 (including the "radical" za (; 'miscellaneous'), where characters that are difficult to analyze graphically are found), are grouped by tone into four groups (each group occupies one juan or fascicle); the characters under each radical are in turn grouped by tone. Secondly, it collects more than 26,000 characters with a huge proportion of variant characters. Many of these variants are not recorded in any other works.

The characters in it are divided, in terms of orthography, into "standard" (; zheng), "vulgar" (; su), "contemporary" (; jin), "archaic" (; gu) and "alternative" (; huozuo), a classification more elaborated than that used in Ganlu Zishu. The pronunciations of characters in it are indicated by either homophone or fanqie spelling. For some characters, only the pronunciations are given, not the meanings.

While being criticized for its unorthodox collation and collection by the Qing philologists, it is hailed by Pan (1980) as an essential guide for deciphering the Dunhuang manuscripts, which contains a large amount of "vulgar" characters.

《龍龕手鏡》又名《龍龕手鑑》（997），是遼代僧人釋行均編寫的漢字字典，用作為佛教徒通解文字、正定字形、注音釋義，俾研讀佛典、透析佛理而編纂的一部佛學字書。龍龕象徵著佛經。此書收錄二萬六千餘字，註釋達16 3170字。

《龍龕手鏡》的遼代原刻本已佚失。現傳最早的有沈括《夢溪筆談》所錄的宋刻本，但因避諱宋太祖趙匡胤祖父「翼祖」趙敬的「敬」字，而改以與「鏡」同義之「鑑」刻名為《龍龕手鑑》。

在中國、日本等國已經不存在這本字典的原本，該字典僅存於韓國，1985年于中國重印。

《龍龕手鑒》屬于中國古代佛教《音義書》之一，本為便于學習佛經所作。在編纂體例方面，《龍龕手鑒》給字排序的方法很有創新性。《龍龕手鑒》之前的漢語詞典要麼從字形上按部首排序，要麼從字音上按讀音排序，而《龍龕手鑒》兩者兼具：以「字形部首」統攝二萬六千餘字，其部首之序，按平上去入四聲為次，計平聲97部，上聲60部，去聲26部，入聲59部，合計242部首。就分部編次上，行均不囿於東漢許慎《說文解字》「據形繫聯」、「始一終亥」的體例，而按當時通行俗體以四聲排列。體例雖不盡然完善，但頗具有創新的精神。《龍龕手鑒》收字達2.6萬個，其中有很多是僅見于《手鑒》的異體字。

字分為正體、俗體、今體、古體和或作體，該分類法比《幹祿字書》的更加詳盡。字音以同音字或反切表示，少數字有音無義。

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