All Star Trek episodes and films in chronological order (Updated January 16, 2021)
2151: Enterprise: Broken Bow → Enterprise: Oasis (1→20)
2152: Enterprise: Detained → Enterprise: Judgment (21→45)
2153: Enterprise: Horizon → Enterprise: Harbinger (46→67)
2154: Enterprise: Hatchery → Enterprise: Bound (68→93)
2155: Enterprise: In a Mirror, Darkly → Enterprise: Terra Prime (94→97)
2231: Short Treks: The Girl Who Made the Stars (98)
2239: Short Treks: The Brightest Star (99)
2254: Short Treks: Q&A & Star Trek: The Cage (100 & 101)
2256: Discovery: The Vulcan Hello → Discovery: Magic to Make the Sanest Man Go Mad (102→109)
2257: Discovery: Si Vis Pacem, Para Bellum → Discovery: Such Sweet Sorrow, Part 2 (110→133)
2258: Short Treks: The Trouble with Edward (134)
2265: Star Trek: Where No Man Has Gone Before (135)
2266: Star Trek: The Corbomite Maneuver → Star Trek: The Conscience of the King (136→146)
2267: Star Trek: The Galileo Seven → Star Trek: The Deadly Years (147→174)
2268: Star Trek: I, Mudd → Star Trek: The Mark of Gideon (175→206)
2269: Star Trek: The Lights of Zetar → The Animated Series: Once Upon a Planet (207→229)
2270: The Animated Series: Bem → The Animated Series: The Counter-Clock Incident (230→235)
2273: Star Trek: The Motion Picture (236)
2285: Star Trek II: The Wrath of Khan, Star Trek III: The Search for Spock, and Short Treks: Ephraim and Dot (237→ 239)
2286: Star Trek IV: The Voyage Home (240)
2287: Star Trek V: The Final Frontier (241)
2293: Star Trek VI: The Undiscovered Country (242)
2364: The Next Generation: Encounter at Farpoint → The Next Generation: The Neutral Zone (243→268)
2365: The Next Generation: The Child → The Next Generation: Shades of Gray (269→290)
2366: The Next Generation: Evolution → The Next Generation: The Best of Both Worlds, Part II (291→317)
2367: The Next Generation: Family → The Next Generation: Redemption (318→342)
2368: The Next Generation: Redemption II → The Next Generation: The Inner Light (343→367)
2369: The Next Generation: Time's Arrow → Deep Space Nine: In the Hands of the Prophets (368→413)
2370: The Next Generation: Descent → Deep Space Nine: The Jem'Hadar (414→467)
2371: Deep Space Nine: The Search, Part I → Voyager: The 37's (468→514)
2372: Voyager: Initiations → Deep Space Nine: Broken Link (515→561)
2373: Voyager: Basics, Part I → Deep Space Nine: Call to Arms (562→614)
2374: Voyager: Scorpion → Deep Space Nine: Tears of the Prophets (615→667)
2375: Deep Space Nine: Image in the Sand → Voyager: Warhead (668→719)
2376: Voyager: Equinox → Voyager: Muse (720→743)
2377: Voyager: Life Line → Voyager: Workforce, Part II (744→763)
2378: Voyager: Human Error → Voyager: Endgame (764→772)
2379: Star Trek: Nemesis (773)
2380: Lower Decks: Second Contact → Lower Decks: No Small Parts (774→783)
2385: Star Trek & Short Treks: Children of Mars (784 & 785)
2399: Picard: Remembrance → Picard: Et in Arcadia Ego, Part 2 (786→795)
3188: Discovery: That Hope Is You, Part 1 (796)
3189: Discovery: Far From Home → Discovery: That Hope Is You, Part 2 (797→808)
4000s: Short Treks: Calypso (809)
If you want to watch the franchise in release order, go here: