Emotion regulation strategies have been characterized as adaptive or maladaptive; however, the ability to switch strategies to best suit the situation (regulatory flexibility and adaptability) underlies effective emotion regulation. Emotional intelligence may be a key capacity that enables flexible emotion regulation. We use experience sampling data from 165 participants to test whether emotional intelligence abilities (emotion understanding and management) predict variability in four emotion regulation strategies. Results show that both the emotion understanding and emotion management branches of emotional intelligence significantly relate to between-strategy variability (with moderate effect sizes), but only emotion understanding significantly predicts within-strategy variability. These findings support the hypothesis that emotional intelligence is an important predictor of the ability to flexibly vary emotion regulation depending on the situation. (PsycInfo Database Record (c) 2022 APA, all rights reserved).