The 24-year-old Crusaders player qualifies to play for Scotland through his paternal grandparents, who were both born in Glasgow.
Maitland, who can play at full-back or on either wing, will join Warriors in the coming weeks subject to a medical and visa, having signed a contract that ties him to Scotstoun until May 2015.
Maitland has scored 24 tries in Super Rugby and crossed four times in a game against the Brumbies last year.
Maitland won world titles with the All Blacks at under-19 and under-20 level and represented the New Zealand Maori in 2010. Head coach Gregor Townsend told www.glasgowwarriors.org: "We're delighted to be welcoming a player of Sean Maitland's calibre to Glasgow Warriors.
"The back three is an area of the team where we already have a number of excellent options, and Sean will provide a further layer of quality as we enter another busy phase of the season.
"His try-scoring record in Super Rugby speaks for itself, and he's also a player who has a big appetite for self-improvement. "He will be a fantastic addition to our squad and will, I'm sure, be very popular with our supporters.
"It's another indication of our increasing profile of Glasgow Warriors that a player of Sean's ability and ambition sees us as a club where he can continue to progress."
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