Segara Anakan Cilacap, being the largest mangrove area in Java Island, is one example of a degraded area which is mostly caused by land conversion to farming lands, ponds, housing, and industrial properties affecting the mangrove community in various ways. The objective of this research is to know the diversity and carbon stock of mangroves in different types of environmental change in Segara Anakan, Cilacap as well as to know the correlation between environmental factors in different types of environmental change with diversity and carbon stock of mangroves in Segara Anakan, Cilacap. This research was conducted using clustered sampling from 8 stations located at the ex rice field, ex shrimp pond, illegal cutting area, and forest. Highest diversity and carbon stock value belongs to stations with forest habitats with a total of 34 tons/ha of carbon stock and highest diversity of saplings in station F1 as much as 1.80. Correlation values between diversity and environmental factors ranged from 0,172-0,449 whereas results between carbon stock and environmental factors range from 0,065-0,724.