Third Lake (Nova Scotia) could refer to one of many lakes:
- Third Lake located at 44°47′20″N 65°11′2″W / 44.78889°N 65.18389°W
- Third Lake located at 45°59′32″N 59°52′54″W / 45.99222°N 59.88167°W
- Third Lake located at 44°22′43″N 65°43′57″W / 44.37861°N 65.73250°W
- Third Lake located at 44°9′28″N 66°5′12″W / 44.15778°N 66.08667°W
- Third Lake located at 45°16′9″N 61°19′7″W / 45.26917°N 61.31861°W
- Third Lake located at 45°8′44″N 61°57′31″W / 45.14556°N 61.95861°W
- Third Lake located at 45°8′59″N 61°55′0″W / 45.14972°N 61.91667°W
- Third Lake located at 45°12′17″N 61°26′42″W / 45.20472°N 61.44500°W
- Third Lake located at 44°47′35″N 63°38′2″W / 44.79306°N 63.63389°W
- Third Lake located at 44°51′13″N 62°40′53″W / 44.85361°N 62.68139°W
- Third Lake located at 44°57′27″N 62°20′31″W / 44.95750°N 62.34194°W
- Third Lake located at 44°31′25″N 63°43′30″W / 44.52361°N 63.72500°W
- Third Lake located at 44°30′30″N 63°54′56″W / 44.50833°N 63.91556°W
- Third Lake located at 45°0′58″N 62°24′30″W / 45.01611°N 62.40833°W
- Third Lake located at 43°40′14″N 65°38′30″W / 43.67056°N 65.64167°W
- Third Lake O'Law located at 46°14′55″N 60°57′0″W / 46.24861°N 60.95000°W
- Third Lake located at 43°59′8″N 65°49′38″W / 43.98556°N 65.82722°W