Early lymphocyte recovery as manifested by an absolute lymphocyte count at d+15 (ALC-15) ≥ 0.5 × 10⁹/L after autologous hematopoietic stem cell transplantation (AHCT) has been associated with a better outcome. This prospective multicenter study aimed to clarify factors associated with ALC-15 ≥ 0.5 × 10⁹/L after AHCT among 178 patients with non-Hodgkin lymphoma. The mobilization capacity, as manifested by peak blood CD34⁺ cell numbers > 45 × 10⁶/L correlated with higher ALC-15 levels (p = 0.020). In addition, the amount of CD3⁺CD4⁺ T cells > 31.8 × 10⁶/kg in the infused graft predicted ALC-15 ≥ 0.5 × 10⁹/L (p < 0.001). Also, the number of infused graft CD3⁺CD8⁺ T cells > 28.8 × 10⁶/kg (p = 0.017) and NK cells > 4.4 × 10⁶/kg was linked with higher ALC-15 (p < 0.001). The two-year progression-free survival after AHCT was significantly better in patients with ALC-15 ≥ 0.5 × 10⁹/L (74 vs. 57%, p = 0.027). The five-year OS in patients with higher ALC-15 was 78% vs. 60% in those with lower ALC-15 (p = 0.136). To conclude, the mobilization capacity of CD34⁺ cells and detailed measures of graft cellular content mark prognostic tools that predict ALC-15 ≥ 0.5 × 10⁹/L, which is associated with a better outcome in NHL patients after AHCT.