Short answer: no. Being a Libra doesn't make someone a narcissist. Narcissistic Personality Disorder is a clinical diagnosis, not a zodiac trait. Libras are often social, charming, and image-aware, which can look self-focused, especially when they avoid conflict. If a Libra in your life seems self-absorbed, it's valid to wonder, but labels aside, watch consistent empathy, accountability, and how they treat your boundaries.
For clarity, focus on patterns over personality: Do they apologize, change, and show empathy when you're hurt? Do you feel safe, seen, and respected over time? Name the behavior, set a clear boundary, and request a repair. If they minimize, deflect, or retaliate, protect your distance. Curiosity about astrology is fine, but your well-being is the more reliable compass.