In this study, we investigated whether the intelligibility-enhancing mode of speech production, known as clear speech produced by native and non-native talkers influenced speech intelligibility equally for native and non-native listeners. We explored the effect of clear speech for various talker and listener pairs in three experiments. In experiment 1, non-native listeners listened to their second language produced by native talkers. In experiment 2, native listeners listened to their native language produced by non-native talkers. In experiment 3, non-native listeners listened to their second language produced by non-native talkers. Combined, the results showed that native speech is overall more intelligible than foreign accented speech for both native and non-native listeners. Importantly, the proportional intelligibility gain for clear speech produced by both native and non-native talkers was similar across listener groups suggesting common speech processing strategies across all talker-listener groups.