To import contacts into Odoo you use two Excel templates: one for companies and one for the contact people who belong to those companies.
Download: Contacts import template (XLSX)
Importing companies
Import the companies first. Use the template Partner Import file - Companies.xlsx (available from Radical Fanatics).
Importing contact people
Next, import the contact people with the template Partner Import file - companies contacts.xlsx (available from Radical Fanatics).
In this file, work with the company ID so that each contact links to the right company. You can also use the same file to import individual people with no company.