Mahannop Road (Thai: ถนนมหรรณพ) is a soi (alley)-like road in Bangkok. This short road is abour 300 m (984.3 ft) long covers the entire distance in the Sao Chingcha subdistrict of Phra Nakhon district in the historic neighbourhood known as Rattanakosin Island.

It starts off separated from the west side of Dinso road in the area of Bangkok City Hall and northwestward up till it meets Tanao road, where notable Chinese joss house dedicated to Xuandi, San Chaopho Suea is situated.

This road was built in 1917 after a great fire on Tanao road, Chaophraya Yommarat (Pan Sukhum), Chancellor of the Metropolitan (modern-day Minister of the Interior and Governor of Bangkok) proposed that the government build a new road for the benefit of traveling and to prevent dangers that may occur in a timely manner. By building on an area where there was a fire.^[1]

When construction was completed, King Vajiravudh (Rama VI) gave it the name Mahannop after Wat Mahannapharam (abbreviated Wat Mahannop) on nearby Tanao road.^[1]

Mahannop road is known for having many eateries and cafés lining its sides like nearby Dinso road and Sam Phraeng.^[1][2] One of them was also selected by the Michelin Guide as Bib Gourmand in 2022.^[3] In addition, it is also home to hostel serving tourists, travel agencies, as well as two 7-Eleven convenience stores.^[4]