Prime Minister Scott Morrison will announce $55 million in community grants to toughen security at mosques, churches, synagogues, temples and religious schools in response to growing concerns about extremism in the wake of the terrorist attack in Christchurch.

Mr Morrison will commit the new funding in a speech on Monday that emphasises the need to defend freedom of religion by protecting Australians at their places of worship.

The grants will range in size from $50,000 to $1.5 million and will be made available for safety measures such as closed-circuit television cameras, lighting, fencing, bollards, alarms, security systems and public address systems.

"When I say I believe in religious freedom – and I am one of its staunchest defenders in Parliament – I know it starts with the right to worship and meet safely without fear," Mr Morrison is expected to say at the Australia-Israel Chamber of Commerce on Monday.