1. Coinbase - Coinbase is one of the most popular cryptocurrency exchanges in the world, offering a user-friendly platform for buying and selling Bitcoin.

2. Bitstamp - Bitstamp is another well-known exchange that allows users to buy Bitcoin with fiat currency. It offers competitive fees and high liquidity.

3. Kraken - Kraken is a reputable exchange that offers a wide range of cryptocurrencies, including Bitcoin. It is known for its security features and advanced trading options.

4. eToro - eToro is a social trading platform that allows users to trade a variety of assets, including Bitcoin. It offers a simple and intuitive interface for buying and selling cryptocurrencies.

5. Binance - Binance is one of the largest cryptocurrency exchanges in the world, offering a wide range of trading pairs for Bitcoin. It is known for its low fees and high liquidity.

6. Gemini - Gemini is a regulated cryptocurrency exchange that offers a secure platform for buying and selling Bitcoin. It is backed by the Winklevoss twins and has a strong reputation in the industry.

7. Bitfinex - Bitfinex is a popular exchange that offers advanced trading features for experienced traders. It has a large trading volume and offers a wide range of cryptocurrencies, including Bitcoin.

8. OKCoin - OKCoin is a global cryptocurrency exchange that allows users to buy and sell Bitcoin with fiat currency. It offers competitive fees and a user-friendly platform.

9. Coinmama - Coinmama is a simple and straightforward platform for buying Bitcoin with a credit or debit card. It is known for its fast and easy verification process.

10. LocalBitcoins - LocalBitcoins is a peer-to-peer marketplace that allows users to buy and sell Bitcoin directly with each other. It offers a wide range of payment options and allows for anonymity in transactions.