1. Secured and Unsecured: Secured debentures are such which create a charge on the assets of the company, thereby mortgaging the assets of the company, in the assets of the company.

2. Registered and Bearer: Registered debentures are those which are duly recorded in the register of debenture holders maintained by the company. These can be transferred only through a regular instrument of transfer. In contrast, the debentures which are transferable by mere deliver are called bearer debentures.

3. Convertible and non-convertible: Convertible debentures are those debentures that can be converted into equity shares after the expiry of a specified period. On the other hand, nonconvertible debentures are those such cannot be converted into equity shares.

4. First and second: Debentures that are repaid before other debentures are could are known as first debentures. The second debentures are those which are paid after the first debenture have been paid back