Honjo (本所) is the name of a neighborhood in Sumida, Tokyo, and a former ward (本所区 Honjo-ku) in the now-defunct Tokyo City. In 1947, when the 35 wards of Tokyo were reorganized into 23, it was merged with the suburban Mukojima ward to form the modern Sumida ward.

The former Honjo ward contained the following modern districts:

• Azumabashi
• Chitose
• Higashikomagata
• Honjo
• Ishiwara
• Kamezawa
• Kikukawa
• Kinshi
• Kotobashi
• Midori
• Mukojima
• Narihira
• Ryōgoku (sumo district)
• Taihei
• Tatekawa
• Yokoami
• Yokokawa

• Honjo High School
• Honjo-Azumabashi Station
• Honjo Matsuzaka-cho Park

35°42′13″N 139°48′04″E / 35.70361°N 139.80111°E / 35.70361; 139.80111