The 2015 Philadelphia Union MLS Regular Season saw the team go 10–17–7, finishing 9th in the Eastern Conference and 18th overall. From the beginning of the season to the summer break, the Union went 4-9-3, including a four-game losing streak from April 19 to May 9. After the summer break, the Union fared only slightly better, going 6-8-4. The Union missed the MLS Cup Playoffs for the 4th consecutive season.

The 2015 Lamar Hunt U.S. Open Cup was the second year in a row in which the Union were runners-up in the Lamar Hunt U.S. Open Cup. The Union entered the competition in the fourth round along with the other 16 US-based MLS clubs. In that round, the Union defeated the Rochester Rhinos, a team in the USL, the third tier of the American soccer pyramid, 3-1 on penalty kicks after a 0-0 draw through extra time. In the next round, the Union defeated D.C. United 2-1. The Union then went on to defeat the New York Red Bulls 4-3 on penalty kicks, after a 1-1 draw aet. In the semifinals, the Union beat the Chicago Fire 1-0. In the final, the Union lost to Sporting Kansas City 6-7 on penalties, after going 1-1.

As of January 24, 2016.

Last updated: January 24, 2016.
Source: Philadelphia Union

DP indicates Designated Player
GA indicates Generation Adidas Player
HGP indicates Home Grown Player
INT indicates MLS International Player and qualifies for an international roster spot

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