Titratable acidity (TTA) is the amount of acid present from titration with an alkali. Titratable acidity of the fermented soy nono ranged from 0.42 to 1.82% while the highest value was recorded (1.82) at 72 h of fermentation. The lactic acid contents obtained in this study compared favourably with the values (0.17 – 1.16) reported in the earlier studies (Oluwabamiwo et al., 2007; Jimoh and Kolapo, 2007). Acidity developed in the different fermented soy products produced depended on the culture for the fermentation. Present results further corroborate the earlier report of Tuitemwong and Tuitemwong (2003) who observed that LAB from different sources was different in their efficiencies to ferment soymilk.