Rafael Montero (born October 17, 1990) is a Dominican professional baseball pitcher in the Houston Astros organization.

[20] Montero finished the season with a 0-1 record, 4.50 ERA in 5 games (one start) with 13 strikeouts in 10 innings pitched with a WHIP of 1.400 while giving up 9 hits, 6 runs (5 of them earned), and 5 walks.

[21] Montero made one start with an ERA of 8.02 pitching 19 innings while giving up 23 hits, 17 runs (all earned), 4 walks and 16 strikeouts.

On December 15, 2020, Montero was traded to the Seattle Mariners in exchange for Jose Corniell and a player to be named later (PTBNL).

[29] On July 27, 2021, Montero was traded to the Houston Astros along with Kendall Graveman in exchange for infielder Abraham Toro and pitcher Joe Smith.

[32] He earned his first save of the season on April 28 pitching in the ninth versus the Rangers, while yielding a home run to Corey Seager before closing out a 3–2 win.

[a][34] On August 15, Montero endured a rare collapse as he was charged three of four runs in the eighth inning without having recorded an out, taking the loss in a 4–2 defeat versus the Chicago White Sox.

[37] Over the 2022 regular season, Montero made 71 relief appearances and accumulated 68+1⁄3 innings, 2.37 ERA, 14 saves, and 5–2 W–L record, and allowed 47 hits, three home runs, and 23 bases on balls with 73 strikeouts.

[39] Montero made his postseason debut on October 11, 2022, in Game 1 of the American League Division Series (ALDS).

[40] Montero appeared in each game of the ALDS, delivered 3+1⁄3 shutout innings, allowed three total baserunners, and struck out three batters.

[41] On November 2, 2022, Montero relieved Bryan Abreu in the eighth inning of Game 4 of the World Series, with a no-hitter on the line.

Montero came close to allowing a hit with two outs in the inning on a line drive to right field, but it was caught with ease by right fielder Kyle Tucker.

[b][42] The Astros defeated the Philadelphia Phillies in six games to give Montero his first career World Series title.

[47] He cleared waivers and accepted an outright assignment to the Triple–A Sugar Land Space Cowboys of the Pacific Coast League (PCL) on August 3.