Movies
* The Three Musketeers (1993) - Constance Bonacieux
* The Best Man (1999) - Robyn
* Just Go with It (2011) - Devlin
* The Campaign (2012) - Mallory
* The Heat (2013) - Gina
* The Wedding Ringer (2015) - Alison
* The Last Man on Earth (2015) - Tilda
* The Intern (2015) - Fiona
* The House (2017) - Lisa
Television
* CSI: Miami (2002-2009) - Natalia Boa Vista (recurring role)
* The L Word (2004-2009) - Alice Pieszecki (recurring role)
* Viva Laughlin (2007) - Evelyn Laughlin (main role)
* Franklin & Bash (2011-2014) - Cindy Hanson (recurring role)
* The Exes (2011-2015) - Holly (main role)
* Doubt (2017) - Sarah (main role)
* The Good Doctor (2017) - Dr. Stella Luna (recurring role)
* Mom (2019) - Dr. Jennifer (recurring role)
* Black Monday (2019-2020) - Dawn (recurring role)
* The Cleaning Lady (2022-present) - Arlene (recurring role)
This is just a sampling of Katherine LaNasa's impressive work. She has also starred in several other movies and TV series, and continues to be active in the entertainment industry.