Donald has won the Grand Final and World Club Challenge with Leeds
Leeds Rhinos winger Scott Donald will retire at the end of the season and return to his native Australia to pursue a career outside of rugby.
The 30-year-old, who had signed a contract extension for next season, joined from Manly in 2006.
He said: "A work opportunity has become available for me back home in Australia, which is outside of rugby.
"It is something that I have had to think long and hard about but I also have to consider my young family."
He added: "The position that the team is in at present was also a big factor for me.
"I would hate to leave the Rhinos in the lurch if we were struggling and I thought I needed to help the club out.
"However, on the contrary, we have got great strength in depth and I know the club will just go on to get stronger and stronger in the years ahead.
"With the Carnegie Challenge Cup Final and the chance to win a fourth title in a row still to come, I felt this was the right time to retire."
Donald has scored 90 tries in 142 starts for the club, and set a record in 2008 after 92 consecutive appearances in the starting line-up.
He was included in the Super League Dream Team on two occasions in 2007 and 2008.
Head coach Brian McClennan said: "Having spoken to Scott over the past few weeks we fully understand his reasons for wanting to return home and make the most of any opportunity for a career after rugby.
My time at the Rhinos will be at the top of the list when I think of the highlights of my career
"Scott has been an outstanding servant for Leeds Rhinos throughout his time at the club, looking after himself as an excellent professional which is demonstrated by his incredible record of fitness over the past four years."
Donald is now hoping to bow out on a high note in the Challenge Cup Final against Warrington later this month.
"My time at the Rhinos will be at the top of the list when I think of the highlights of my career," he said.
"I just hope I can help the team to finish my time at the club on a high in the coming months."