Chikashi Koizumi (?? ?? Koizumi Chikashi; 1886–1927) was a Japanese tanka poet.
After initially working as a primary school teacher in his native Chiba Prefecture, he moved to Tokyo and became a full-time poet.
He published in several prestigious poetry magazines, even helping to found both Araragi and Nikko, before setting up his own poetic society, the Aogaki-kai, and taking on disciples.
He died before the society's organ could see print.