He was joined by righthand chiefs Peter Stewart and Rita Broe. Sir Tim was knighted for services to public engagement with science.
His colleagues became Members of the Royal Victorian Order (MVO) for personal services for the Queen for their work on the Big Jubilee Lunch.
Eden Project chairman Richard Eyre said: "We are very proud of these special people. They are characteristic of the energy, passion and sheer hard work of the many people who keep Eden wonderful."
Last year Sir Tim was made Honorary Knight Commander of the Most Excellent Order of the British Empire (KBE). Netherlands-born Sir Tim took UK citizenship this March to make his knighthood "substantive" and take the title Sir Tim Smit.
Peter Stewart, Eden’s campaigns and communications director, and strategic marketing director Rita Broe helped spearhead the Big Lunch in June, which this year was part of The Queen’s Diamond Jubilee celebrations.
The national event attracted a record-breaking 8.5m people all around the UK and in 70 countries across the globe who wanted to celebrate the Jubilee and build stronger communities.