The 30-year-old, who has won 94 Tests for the All Blacks, has signed a two-year contract with Japanese club NTT Docomo from next year.
Muliaina told www.allblacks.com: "I consider myself to have been incredibly lucky with my career in New Zealand. Rugby has offered me so many wonderful opportunities and experiences that will stay with me forever.
"It's hard to single any one moment out but obviously winning Commonwealth gold and the opportunity to captain my country were things I thought were only dreams when I was growing up.
"But, once this season is over it will be time for something different. Japan itself offers a completely different culture and way of life that my entire family is looking forward to experiencing."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.