Ronnie Ellis Williams (born January 6, 1996) is an American professional baseball pitcher for the Guerreros de Oaxaca of the Mexican League.

[3] Williams spent the 2015 season with the rookie–level Johnson City Cardinals, making 12 starts and going 3–3 with a 3.70 ERA and 43 strikeouts in 56.0 innings of work.

[5] Williams returned to Peoria in 2017, making 36 appearances out of the bullpen but struggling to a 6.94 ERA with 95 strikeouts in 83.0 innings of work.

[9] On December 10, 2020, Williams was selected by the San Francisco Giants in the minor league phase of the Rule 5 Draft.

[10] He was assigned to the Richmond Flying Squirrels of the Double-A Northeast to begin the 2021 season and was promoted to the Sacramento River Cats of the Triple-A West in early September.

He made 10 appearances (9 starts) for the Triple-A Sacramento River Cats, posting a 1-2 record and 7.64 ERA with 31 strikeouts in 33.0 innings pitched.