| Office: | President of the Landtag of Liechtenstein |
| Death Place: | Vaduz, Liechtenstein |
| Birth Date: | 1 July 1929 |
| Birth Place: | Vaduz, Liechtenstein |
| Termstart: | January 1978 |
| Termend: | December 1992 |
| Termend1: | December 1973 |
| Termstart1: | January 1970 |
| Predecessor: | Gerard Batliner |
| Predecessor2: | Alexander Frick |
| Monarch2: | Franz Joseph II |
| Successor: | Ernst Walch |
| Successor2: | Gerard Batliner |
| Party: | Patriotic Union |
| Parents: | Alois Ritter Isabella Gassner |
| Children: | 4 |
Karlheinz Ritter (1 July 1929 – 18 July 2008) was a lawyer and politician from Liechtenstein who served as the President of the Landtag of Liechtenstein from 1970 to 1973 and again from 1978 to 1992. He is the longest individual to hold the position.
Ritter was born on 1 July 1929 in Vaduz to the son of lawyer Alois Ritter and his mother Isabella Gassner as one of four children. He studied law in Bern where he received a diploma in 1950.[1]
In 1958, he joined his father's law firm Ritter & Beck Rechtsanwälte in which he took over upon his death on 31 January 1966.[2] From 1966 to February 1993 Ritter served in the Landtag of Liechtenstein becoming the President of the Landtag of Liechtenstein twice from January 1970 to December 1973 and again from January 1978 to December 1992.[3] He also served as a member of the state board of education between 1962 and 1969.
Ritter married Erika Kranz (born 6 June 1926) on 24 November 1951 and they had four children together.
Ritter died on 18 July 2008 in Vaduz, at the age of 79 years old. His daughter Cornelia Ritter is currently a co-owner of law his firm, taking it over after his death.[4]