It is widely believed that most, if not all, large galaxies contain a supermassive black hole at their center. However, it's important to note that not all galaxies have been thoroughly studied, and the presence or absence of a central black hole cannot always be directly observed or confirmed.

Observations and theoretical models suggest that galaxies with a significant mass tend to have a supermassive black hole at their core. The presence of a black hole is thought to play a crucial role in galaxy formation and evolution. The gravitational influence of the black hole is believed to affect the surrounding stars, gas, and dark matter, shaping the structure and dynamics of the galaxy.

However, it's worth mentioning that some dwarf galaxies or smaller galaxies may not contain a supermassive black hole. These smaller galaxies might have different formation processes and internal dynamics, and their central regions might be dominated by other structures or stellar clusters rather than a black hole.

As our understanding of galaxies and their central regions continues to advance through observations and theoretical studies, the presence and properties of black holes in different types of galaxies remain an active area of research.