The Fair Work Ombudsman will audit up to 200 businesses throughout western Sydney as part of a new campaign to check that employers are paying the correct wages and are compliant with record-keeping and pay-slip obligations.

The campaign which will focus on businesses located in and around Merrylands, Guildford, Fairfield, Parramatta and Mount Druitt will see inspectors checking that employers are paying the correct minimum hourly rates, penalty rates, allowances, loadings and providing appropriate meal breaks to their employees.

Employers from a range of sectors will be included, such as manufacturing, road freight transport, carpentry, building and industrial cleaning, computer system design, cafes and restaurants, investigation and security, childcare, hairdressing and beauty, and employment placement and recruitment.

All businesses will be randomly selected, according to the media release from the office of the ombudsman.

Fair Work Ombudsman Natalie James says western Sydney is home to thousands of businesses and the Agency receives a constant stream of requests for assistance from employees across the western suburbs.

She says one of the aims of the campaign is to ensure employers are aware of their workplace responsibilities and how the Agency can assist them to access, understand and apply information to build a culture of compliance.

"It's important we check workers are being paid correctly, but we also want to be pro-active about ensuring employers understand their obligations," Ms James said.