Commander Kamau Mbunga was a Human Starfleet officer during the 2260s.

In 2267, Mbunga was serving as the first officer of the USS Defiant when it encountered the cloaked IKS Kretoq in the Alamedus system and was forced to chase after it. (ST novella: The First Peer)

In 2268, Mbunga was still on the Defiant when it was lost in interphase. (TOS episode: "The Tholian Web", VAN novel: What Judgments Come)

Defiant personnel
Federation, Starfleet	USS Defiant (NCC-1764)	Tonia Barrows • Thomas Blair • Stephen Garrovick • Hamilton • Kamau Mbunga • Clarissa Nyn • Ravishankar Sabapathy • Serling • Terry Shull • Stevok • Erin Sutherland • T'Lehr • Mariah Willoughby
	USS Defiant (NX-74205) (I)	Arla Rees • Julian Bashir • Helen Blake • Bremerton • Sarita Carson • Ezri Dax • Jadzia Dax • Michael Eddington • Hector Ilario • Kelly • Kira Nerys • Kizilbash • Koletta • Meyer • Enrique Muñiz • Nog • Miles O'Brien • Odo • Reese • Paxton Reese • Krissten Richter • Benjamin Sisko • Fabian Stevens • T'Rul • Cregger Lor Mowlanish Dor Crixa Tel • Tutu • Worf, son of Mogh
	USS Defiant (NCC-75633) (II)	Julian Bashir • Boehm • Sam Bowers • John Candlewood • Jeannette Chao • Ezri Dax • Greg Forte • Darrell Gervasi • Quin Heins • Tiris Jast • Kira Nerys • Lankford • Mikaela Leishman • Aaron McCallum • Minecci • Calvin Moore • Lisa Neeley • Nog • Miles O'Brien • Odo • Tariq Rahim • Krissten Richter • Gerda Roness • Jason Senkowski • Benjamin Sisko • Nancy Sthili • Stov • Prynn Tenmei • Thirishar ch'Thane • Thron • T'rb • Elias Vaughn • Worf, son of Mogh • Amy Zucca
mirror universe	ISS Defiant (Constitution-class) Terran Empire, Starfleet	Jonathan Archer • Travis Mayweather • Phlox • Malcolm Reed • Hoshi Sato • T'Pol • Charles Tucker III
	Defiant Terran Rebellion	Leeta • Miles O'Brien • Benjamin Sisko