The Hornets took a first-half lead through Lucas Rodrigues, playing his 200th game in yellow and green, but goals for Chippenham in the second half by Luke Haines and Tom Mehew put the Wiltshire side in front.
But substitutes Leone Gravata and Jack Bates scored to give the Hornets the points.
Dominic Di Paola’s side finish the season in 15th place, well clear of the relegation zone, as they have been throughout.
See pictures by Butterfly Football’s Natalie Mayhew on this page and those linked and get the latest from the Hornets camp in the West Sussex County Times, out Thursday.
65. Horsham v Chippenham Town pictures by Natalie Mayhew - Butterfly Football (3).jpg
Horsham v Chippenham Town, National League South Photo: Natalie Mayhew - Butterfly Football
66. Horsham v Chippenham Town pictures by Natalie Mayhew - Butterfly Football (6).jpg
Horsham v Chippenham Town, National League South Photo: Natalie Mayhew - Butterfly Football
67. Horsham v Chippenham Town pictures by Natalie Mayhew - Butterfly Football (2).jpg
Horsham v Chippenham Town, National League South Photo: Natalie Mayhew - Butterfly Football
68. Horsham v Chippenham Town pictures by Natalie Mayhew - Butterfly Football (19).jpg
Horsham v Chippenham Town, National League South Photo: Natalie Mayhew - Butterfly Football