Presently, it usually refers to "Ogura Hyakunin Isshu," one of shisen wakashu (personal collection of poetry) compiled by FUJIWARA no Teika (Sadaie), gathering a hundred tanka (classical Japanese poem in 31 syllables) by a hundred outstanding poets from the 600s until about 1205 when "Shinkokin Wakashu" (New Collection of Ancient and Modern Japanese Poetry) was compiled.
現在の日本においては通常、その中でも、小倉百人一首と通称される、藤原定家撰による新古今期までの代表的な歌人百人について作られた私撰和歌集を指す。