Here are a few of my favorites:
Hans Dieter Betz, _Galatians_, Hermenia Series, Fortress Press,
Philadelphia, 1979. (Very influential as a model of rhetorical
Richard Longenecker, _Galatians_, Word Biblical Commentary vol 41,
Dallas, Word Books, 1990.
Frank Matera, _Galatians_, Sacra Pagina series vol. 9, Collegeville,
MN,Michael Glazier Book, The Liturgical Press, 1992.
F.F. Bruce, _The Epistle to the Galatians: A Commentary on the Greek
Text, The New International Greek Testament Commentary, Grand Rapids,
William B. Eerdmans, 1982. ( A solid conservative work).
George Howard, _Paul:Crisis in Galatia_, Cambridge University Press,
1979. (Not strictly a commentary)
Douglas Kim Fletcher, _The SIngular Argument of Paul's Letter to the
Galatians_, 1982 Ph.D. dissertation. Princeton Theological Seminary.
(Again, more a study than a commentary.)
Barclay, J.M.G., _Obeying the Truth: A Study of Paul's Ethics in
Galatia_, Edinburgh: T & T Clark, 1988. (Another study rather than
Hope this helps!
The Southern Baptist Theological Seminary