Miguel Odalis Tejada Martinez (born on May 25, 1974 in Baní, Dominican Republic) is a Major League Baseball shortstop for the Houston Astros. He began his first six seasons of his career with the Oakland Athletics, where he began his streak of 1,152 consecutive games, that ended with the Baltimore Orioles on June 22, 2007. In 2002, he was awarded the AL MVP award, and he was the MVP of the 2005 All-Star Game. Tejada entered the 2007 season with an active streak of eight straight 20 home run seasons. His nickname is "La Gua Gua" which means "the bus" in certain Spanish dialects, as Tejada is known to drive in runs. On February 11, 2009, he plead guilty to one count of perjury for lying to Congress in his testimony on whether or not Rafael Palmeiro lied about whether or not he used steroids.

Tejada grew up in extreme poverty in Baní, a city approximately 40 miles (65 km) southwest of Santo Domingo, capital of the Dominican Republic. Miguel Tejada grew up idolizing the Baltimore Orioles shortstop Cal Ripken Jr.

At age 19 his childhood dream of playing professional baseball was realized when he signed with the Oakland Athletics for two thousand dollars, although at the time the organization believed him to be 17 years old. Another debate at this time was the argument over whether he had a name change because his birth certificate says Mark Stefanyshyn.