This study explored links between narrative identity, personality traits, and well‐being for 263 adolescents (age 12–21) from three New Zealand cultures: Māori, Chinese, and European. Turning‐point narratives were assessed for autobiographical reasoning (causal coherence), local thematic coherence, emotional expressivity, and topic. Across cultures, older adolescents with higher causal coherence reported better well‐being. Younger adolescents with higher causal coherence instead reported poorer well‐being. Personal development topics were positively linked to well‐being for New Zealand European adolescents only, and thematic coherence was positively linked to well‐being for Māori adolescents only. Negative expressivity, neuroticism, conscientiousness, and openness were also linked to well‐being. Implications of these cultural similarities and differences are considered for theories of narrative identity, personality, and adolescent well‐being.