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To see a comprehensive list of regulatory agencies by country look at wikipedia
Some of them are more important than others, due to their influence on global capital markets. The chief among them would be the regulatory agencies from the United States, the Eurozone, China, the UK, India, Japan and others. Mainly to do with the money flow and the importance of the sovereign currency in capital markets and in the financial system as a whole.
There are some ancillary agencies that are of importance to the CM sector, these are the regulations on (Know Your Customer) KYC & (Know Your Customer's Customer) KYCC, (Anti Money Laundering)AML, (Terrorist Financing) TF, (Customer Due Diligence) CDD. The chief international agency for this is FATF/GAFI. Although they are an advisory agency, their recommendations carry outsize influence. However, some of them are more important than others, due to their outsize influence on the global capital markets. The chief among them would be the regulatory agencies from the United States, the Eurozone, China, the UK, India, Japan and others. Mainly to do with