笠松紫浪

thumb|In the garden of artist Itō Shinsui’s Tokyo home. Left to right, back row: Moriyama Tesutaro (assistant to publisher Watanabe); Kawase Hasui, collector Robert O. Muller, Inge Muller, Itō Yoshiko and Itō Shinsui. Left to right, front row: Kasamatsu Shirō and publisher Watanabe Shōzaburō, April 1940 was a Japanese engraver and print maker trained in the Shin-Hanga and Sōsaku-Hanga styles of woodblock printing.

Kasamatsu was born in Tokyo in 1898 and apprenticed at the age of 13 to Kaburagi Kiyokata (1878–1973), a traditional master of Bijin-ga, pictures of beautiful women. Kasamatsu however took an interest in landscape and was given the pseudonym Shiro by his teacher, which he used as a signature mark in his prints. Kasamatsu exhibited his paintings in the Bunten and Teiten, government sponsored juried exhibitions.

Kasamatsu completed his first woodblock prints in 1919 for Shōzaburō Watanabe after the publisher saw his paintings on exhibit. Almost all the woodblocks were destroyed in a fire in Watanabe's print shop following the Great Kanto Earthquake of 1923. Around 50 prints were published by Watanabe by the late 1940s. Kasamatsu began to partner with Unsodo in Kyoto from the 1950s and produced over 100 prints by 1960. He also began to print and publish on his own in the Sōsaku-Hanga style.

He produced nearly 80 Sōsaku-Hanga prints between 1955 and 1965.