Martinec (feminine: Martincová) is a Czech surname. Notable people include:
- Boris Martinec (born 1988), Croatian figure skater
- Emil Martinec (born 1958), American physicist
- Eva Martincová (born 1975), Czech tennis player
- Hynek Martinec (born 1980), Czech painter
- Patrik Martinec (born 1971), Czech ice hockey player
- Přemysl Martinec , Czech surrealist
- Tereza Martincová (born 1994), Czech tennis player
- Vladimír Martinec (born 1949), Czech ice hockey player