Loudoun United FC is an American professional soccer team based in Leesburg, Virginia.

[1] After the founding of MLS Next Pro in 2022 and the subsequent movement of MLS reserve teams to that league by 2023, Loudoun United remained the only MLS-affiliated reserve side in the USL system; due to a legal agreement for leasing Segra Field, United is required to play in the second division.

On February 2, 2023, Loudoun United FC was sold to Attain Sports and Entertainment, which owns minor league baseball teams Bowie Baysox and Frederick Keys.

[5] The club plays at Segra Field, a new 5,000-seat stadium at Philip A. Bolen Memorial Park in Leesburg.

[11] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.