Taoyuan International Airport Services (Abbreviation: TIAS; Chinese: 桃園國際機場地勤服務公司, commonly abbreviated 桃園航勤), founded in 1979, is currently the largest ground handling provider at Taoyuan International Airport, providing services for 30 scheduled airlines, out of 38 that served in Taoyuan International Airport.

TIAS provides ground handling services, which includes baggage handling, aircraft load control, aerobridge and passenger steps operation, loading and unloading of aircraft, and cargo and mail delivery, to airline customers.

TIAS provides handling for 30 airlines out of 38 that operates in Taoyuan International Airport.

Therefore, the company had a market share of over 75% in handling services at Taoyuan International Airport.

However, on 30 December 1999, UPS acquired a 6% stake in TIAS from China Airlines.