This is perhaps the most debated question in Australian menswear. The answer depends entirely on the specific dress code and venue:

• Yes: For Cocktail, Smart Casual, or Winery/Rustic weddings. A pristine, polished pair of R.M. Williams Craftsman boots (specifically in Yearling leather, not suede/nubuck) is considered a staple of Australian style and is perfectly acceptable.
• No: For strict Black Tie weddings. Tradition dictates patent leather oxfords or velvet loafers. While some Australians do wear boots to Black Tie events, it technically breaks the rules of formal evening wear.
• The Compromise: If you must wear boots, ensure they are black, highly polished, and worn with a suit trouser that has a slightly wider break to accommodate the boot shaft.