Yes! You can import people and companies from separate CSV or Excel files straight into Depot.
Once you have your files exported or collated from your existing setup, simply browse to the import page (through the connections cog) and upload the to the appropriate area.
You will then be asked to match the columns in your file to the available fields in Depot. Click save, and sit back while the magic happens.
If you are collating contacts by hand, you might want to use this Excel file as a template.