The current study was conducted to determine prevalence of sub clinical mastitis (SCM) in indigenous goats in semi-arid zone of Northern Hemisphere of India. A total of 430 milk samples from 217 lactating indigenous goats (4 blind teats) of different breed suspected for SCM were collected and screened for SCM by California Mastitis Test. The overall prevalence of SCM was reported to be 23.04 % (50 out of 217). Highest prevalence was reported in Bharatpur district of Rajasthan (33.34%) followed by Aligarh, Uttar Pradesh (31.25%) and lowest in Mathura, Uttar Pradesh (16.21%). Considering the individual udder halves, right quarter was found to be more prone to SCM than left quarter. Jakhrana breed of goat possessed highest prevalence followed by Jamnapari, Sirohi, Barbari, Beetal and Black Bengal breed. The prevalence showed an increasing trend as age of goat increases as well as parity / lactation. Similarly, more prevalence was observed in late lactation than mid and early lactation. The season wise incidence of SCM revealed highest in winter than summer season. This suggests endemicity of SCM in lactating goats in this region. Hence, early preventive measures should be taken to control of SCM to reduce further economic loss.