Here is a list of every driver who started an F1 race for Haas.
2016
Romain Grosjean
Esteban Gutierrez
2017
Romain Grosjean
Kevin Magnussen
2018
Romain Grosjean
Kevin Magnussen
2019
Romain Grosjean
Kevin Magnussen
2020
Romain Grosjean
Kevin Magnussen
Pietro Fittipaldi