Kallumthazham or Kallumthaazham is a neighbourhood of Kollam city in Kerala, India. It is the 19th ward of Kollam Municipal Corporation.

Kollam Bypass is a part of NH 66 that bypasses CBD of Kollam city in Kerala, India. The busy 13.141 km long bypass starts at Mevaram in the south to Kavanad in the north, via Ayathil, Kallumthazham, Kadavoor and Kureepuzha in Kollam city. It is a joint venture between the central and state government. It was inaugurated on 15 January 2019 by Prime Minister Narendra Modi.