Mansen Shukai (also called Bansen Shukai; "万川集海" is officially written as "萬川集海" in Chinese characters) is the ninjutsu (ninja art) strategy book including 22 volumes with an additional one volume attached to it written by Samuji Yasutake FUJIBAYASHI, who was a descendant of goshi (country samurai) Nagatonokami FUJIBAYASHI, in Iga Province in 1676.
万川集海(まんせんしゅうかい、ばんせんしゅうかい、正式には『萬川集海』と表記する）とは延宝四年(1676年)に伊賀の国、郷士で藤林長門守の子孫である藤林左武次保武が書いた22巻、別巻1からなる忍術兵法書である。