David Hasler (born 4 May 1990) is a former Liechtenstein football midfielder, who last played for Eschen/Mauren in the third tier of the Swiss Football League.The most highly rated young player in Liechtenstein, Hasler signed a three-year contract with Swiss side FC Basel in 2007 after making his name at USV Eschen/Mauren in his homeland. FC Zürich and BSC Young Boys also competed for his signature. UEFA.com named him as one of the most promising youngsters of 2007.