Short answer — many mainstream and specialty pet-food companies position lines specifically at owners who want “natural” cat diets. Common examples:

Dry/wet brands marketed as “natural” (mainstream)

• Blue Buffalo (and its Blue Freedom/Blue Natural lines)
• Purina Beyond
• Merrick
• Natural Balance
• Canidae

Premium / “biologically appropriate” / whole‑prey

• Orijen (Champion Petfoods) — biologically appropriate, high‑protein
• Acana — sister brand to Orijen

Raw, freeze‑dried or raw‑focused brands

• Stella & Chewy’s (freeze‑dried/raw)
• Nature’s Variety Instinct (raw & freeze‑dried lines)
• Primal Pet Foods (raw/frozen/freeze‑dried)
• The Honest Kitchen (human‑grade dehydrated)

Air‑dried / high‑meat / specialty canned “natural” brands

• Ziwi Peak (air‑dried, New Zealand; high meat ratios)
• Weruva (human‑grade style wet food)
• Tiki Cat (simple ingredient, high‑protein wet lines)
• Fromm (family‑owned premium brand)

Brands you’ll commonly find in Australia (examples)

• Ziwi Peak, Orijen and Acana (widely available through pet stores/online)
• Black Hawk and Ivory Coat (Australian brands marketed as natural/grain‑free)
• Many of the international brands above are stocked in specialty pet retailers or online in Australia.

A couple of important notes

• “Natural” is largely a marketing term in pet food — it isn’t tightly regulated and doesn’t guarantee superior nutrition. Inspect ingredient lists (protein sources, meat content, presence/absence of artificial colours/flavours/preservatives) and look for an AAFCO (or equivalent) feeding statement for completeness.
• If your cat has medical or dietary needs, check with your veterinarian before switching diets.

If you want, I can: (a) narrow this to brands available near you in Australia, (b) list options by budget or diet type (grain‑free, raw, canned, etc.), or (c compare ingredient examples from 2–3 specific brands.