Elías Sosa Martínez (born June 10, 1950) is a Dominican former professional baseball pitcher.

He was signed by the San Francisco Giants of Major League Baseball (MLB) as an amateur free agent on March 4, 1968, and played for the Giants (1972–1974), St. Louis Cardinals (1975), Atlanta Braves (1975–1976), Los Angeles Dodgers (1976–1977), Oakland Athletics (1978), Montreal Expos (1979–1981), Detroit Tigers (1982), and San Diego Padres (1983).

In 1973, he saved nine of teammate Ron Bryant's major league-leading 24 wins, including #20.

He finished in the top ten American League or National League pitchers four times for games pitched and games finished, three times for saves, and once for winning percentage.

He gave up the second home run of three hit by Reggie Jackson of the New York Yankees in Game 6 of the 1977 World Series.