Fungu Yasini Island (Kisiwa cha Fungu Yasini, in Swahili) is a protected, uninhabited island under the Dar es Salaam Marine Reserve (DMRS) with the IUCN category II located within Kinondoni District of Dar es Salaam Region in Tanzania.

On the west and north sides of the lower intertidal zone, there is a lot of sea grass mixed in with patches of coral.

It is located in the northern part of Dar es Salaam, immediately following Mbudya Island Marine Reserve.

Sea grass and coral patchy areas coexist on the west and north edges of the lower intertidal zone.

Similar to other DMRS islands, Thalassia hemprichii and Thallasodentron ciliatum are the two most common species of sea grass.