Matthew Tyler Costello (born August 5, 1993) is an American-born naturalized Ivorian professional basketball player for Valencia of the Spanish Liga ACB and the EuroCup.

Costello averaged 25.1 points, 19.1 rebounds, 4.0 assists and 4.0 blocks per game at Bay City Western for Coach Chris Watz.

Costello led the Warriors to the Class 4A regional semifinals, an 18–6 record, and a second-straight district championship.

He helped his team improve from 10 to 11 in 2010 to 24–3 in 2011, leading Bay City Western to Class A state semifinals for the first time in school history.

In 2010 Bay City Times named him to the Dream Team and first-team All-Saginaw Valley League selection.

1 Indiana (2/19), and blocked two shots each against Texas Southern (11/18), Nebraska (2/16) and Valparaiso (3/21) in the second round of the NCAA Tournament.

[1] Costello appeared in 34 games, starting 20, averaging 4.0 points and 3.3 rebounds in 14.7 minutes per contest, He led the team with 43 blocks, ranking 10th in the Big Ten (1.3 bpg).

Costello ranked second on the team in field-goal percentage (.598) In December he missed 4 games due to mononucleosis.

Costello managed to score in double figures in 11 games and grabbed double-figure rebounds in two contests.

Costello was a team leader in many categories and led MSU in scoring in two games and in rebounding in eight contests.

[13] Five days later, he was acquired by the Iowa Energy of the NBA Development League as an affiliate player of the Grizzlies.

On July 5, 2021, Costello officially signed a three-year contract with fellow Liga ACB club Baskonia, marking his EuroLeague debut.

[20] Costello was granted the Ivorian citizenship and played with the Ivory Coast national basketball team during AfroBasket 2021.