See also my older list (a bit dated, though); also the amazon Top 100 list for Catholic Theology and the amazon Top 100 for Christian Apologetics (not just Catholic).
Ahlquist, Dale, Common Sense 101: Lessons from G.K. Chesterton, Ignatius Press, 2006.
Akin, Jimmy, Mass Confusion, Catholic Answers, 2nd expanded edition, 1999.
Akin, Jimmy, The Salvation Controversy, Catholic Answers, 2001.
Aquilina, Mike, The Fathers of the Church: An Introduction to the First Christian Teachers, Our Sunday Visitor, 1999.
Aquilina, Mike, The Mass of the Early Christians, Our Sunday Visitor, 2001.
Armstrong, Dave, A Biblical Defense of Catholicism, Manchester, NH: Sophia Institute Press, 2003.
Armstrong, Dave, The Catholic Verses, Manchester, NH: Sophia Institute Press, 2004.
Armstrong, Dave, The One-Minute Apologist, Manchester, NH: Sophia Institute Press, 2007.
Armstrong, Dave & Paul Thigpen, The New Catholic Answer Bible, Huntington, IN: Our Sunday Visitor, 2005.
Benedict XVI, Pope, Jesus of Nazareth, Doubleday, 2007.
Bennett, Rod, Four Witnesses: The Early Church in Her Own Words, Ignatius Press, 2002.
Currie, David B., Born Fundamentalist, Born Again Catholic, San Francisco: Ignatius Press, 1995.
Currie, David B., Rapture: The End-Times Error That Leaves the Bible Behind, Sophia Institute Press, 2003.
Dubruiel, Michael, The How-To Book of the Mass: Everything You Need to Know but No One Ever Taught You, Our Sunday Visitor, 2002.
Hahn, Scott & Leon J. Suprenant, editors, Catholic for a Reason: Scripture and the Mystery of the Family of God, Emmaus Road Publishing, 1998.
Hahn, Scott, The Lamb's Supper: The Mass as Heaven on Earth, NY: Doubleday, 1999.
Hahn, Scott, Reasons to Believe: How to Understand, Explain, and Defend the Catholic Faith, Doubleday, 2007.
Hahn, Scott and Kimberly, Rome Sweet Home, San Francisco: Ignatius Press, 1993.
Hahn, Scott, Swear to God: The Promise and Power of the Sacraments, Doubleday, 2004.
Howard, Thomas, Evangelical is Not Enough, Nashville: Nelson, 1984.
Howard, Thomas, On Being Catholic, San Francisco: Ignatius Press, 1997.
John Paul II, Pope, Man and Woman He Created Them: A Theology Of The Body, Pauline Books & Media, 2006.
Jones, Alex, No Price too High: A Pentecostal Preacher Becomes Catholic, Ignatius Press, 2006.
Keating, Karl, Catholicism and Fundamentalism, San Francisco: Ignatius, 1988.
Keating, Karl, What Catholics Really Believe, San Francisco: Ignatius Press, 1995.
Kreeft, Peter, Catholic Christianity: A Complete Catechism of Catholic Beliefs Based on the Catechism of the Catholic Church, Ignatius Press, 2001.
Kreeft, Peter and Blaise Pascal, Christianity for Modern Pagans: Pascal's Pensees, Ignatius Press, 1993.
Kreeft, Peter, Everything You Ever Wanted to Know About Heaven, but Never Dreamed of Asking, Ignatius Press, 1990.
Kreeft, Peter, Fundamentals of the Faith: Essays in Christian Apologetics, Ignatius Press, 1988.
Kreeft, Peter & Ronald K. Tacelli, Handbook of Christian Apologetics, Downers Grove, IL: InterVarsity Press, 1994.
Kreeft, Peter, Making Sense Out of Suffering, Servant Ministries, 1986.
Kresta, Al, Why Are Catholics So Concerned About Sin?: More Answers to Puzzling Questions About the Catholic Church, Servant Publications, 2005.
Kresta, Al, Why Do Catholics Genuflect?: And Answers to Other Puzzling Questions About the Catholic Church, Charis Books, 2001.
Madrid, Patrick, ed., Surprised by Truth, San Diego: Basilica Press, 1994.
Madrid, Patrick, ed., Surprised by Truth 2, Sophia Institute Press, 2000.
Madrid, Patrick, Pope Fiction, San Diego: Basilica Press, 1999.
Madrid, Patrick, Where Is That In the Bible?, Our Sunday Visitor, 1999.
Michuta, Gary G., Why Catholic Bibles Are Bigger, Grotto Press, 2007.
Pinto, Matthew J., Did Adam and Eve Have Belly Buttons?: And 199 Other Questions from Catholic Teenagers, Ascension Press; Revised edition, 2003.
Pinto, Matthew J., Did Jesus Have a Last Name? And 199 Other Questions from Catholic Teenagers, Ascension Press, 2005.
Ray, Stephen K., Upon This Rock, San Francisco: Ignatius Press, 1999.
Ray, Steve, Crossing the Tiber, San Francisco: Ignatius Press, 1997.
Schreck, Alan, Catholic and Christian: An Explanation of Commonly Misunderstood Catholic Beliefs, Servant Publications; Rev edition, 2004.
Shea, Mark P., By What Authority?: An Evangelical Discovers Catholic Tradition, Huntington, IN: Our Sunday Visitor, 1996.
Shea, Mark P., Making Senses Out of Scripture, Basilica Press, 1999.
Stravinskas, Peter. M. J., Our Sunday Visitor's Catholic Encyclopedia, Our Sunday Visitor; Revised edition, 1998.
Trigilio, John, & Kenneth Brighenti, Catholicism for Dummies, 2003.
Trigilio, John, & Kenneth Brighenti, The Catholicism Answer Book: The 300 Most Frequently Asked Questions, Sourcebooks, Inc., 2006.
West, Christopher, Good News About Sex and Marriage: Answers to Your Honest Questions About Catholic Teaching, Servant Publications; Revised edition, 2004.
West, Christopher, Theology Of The Body For Beginners, Ascension Press, 2004.