Hulu is currently listing that it will stream the “first season” of the Gintama television anime series with English subtitles and with an English dub starting on December 1, 2019. The first season covers Episodes 1-49. Hulu does not list the show’s English dub cast. This is the first time that these episodes will have an English dub. TV Tokyo is listed as the licensor.
The only previous episodes to receive an English dub are Episodes 266 through 316 (considered Season 3 of the anime). Those episodes are available to stream on Crunchyroll and FUNimation.