The Union Jack packaging will roll out across its Soft White range, in supermarkets from the end of March.
The patriotic design and "100% British Wheat" tagline are being introduced to promote Hovis' use of flour milled from UK wheat.
Packs will use colour coding to describe the loaves' thickness.
The Premier Foods-owned brand believes the packaging will appeal to those who are excited about the impending Royal Wedding.
It mirrors a similar move by Tesco, which recently launched a 100% British, "patriotic," range of yoghurts, called Yoo.
Hovis is supporting the launch with marketing across TV and digital, and a partnership with The Sun newspaper.
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