Of the 115 films listed below Sid James only used the name...
Syd, Sid or Sidney 16 times the first one was in Miss Robin Hood and 6 of them were in the CARRY ON films that makes 13 Carry on films where he didn't use his own name.
Filmography
Black Memory (1947) as Eddie Clinton
The October Man (1947) as Man Crossing Railway Bridge (unaccredited)
Night Beat (1947) as Nixon
No Orchids for Miss Blandish (1948) as Ted (unaccredited)
The Small Back Room (1949) as 'Knucksie' Mortan, barkeeper
Once a Jolly Swagman (1949) as Rowton
Paper Orchid (1949) as Freddy Evans
Give Us This Day (1949) as Murdin
Man in Black (1949) as Henry Clavering/Hodson
Last Holiday (1950) as Joe Clarence
The Lady Craved Excitement (1950) as Carlo
Talk of a Million (1951) as John C. Moody
The Galloping Major (1951) as Bottomley - the bookmaker
The Lavender Hill Mob (1951) as Lackery
Lady Godiva Rides Again (1951) as Lew Beeson
The Magic Box (1951) as Sergeant in Storeroom (cameo)
I Believe in You (1952) as Sergeant Boy
The Tall Headlines (1952) as Mr. Spencer
Emergency Call (1952) as Danny Marks
Time Gentlemen, Please! (1952) as Eric Hace
Gift Horse (1952) as Ned Hardy, Owner
Golden Bull Father's Doing Fine (1952) as Taxi Driver
Venetian Bird (1952) as Bernardo
Miss Robin Hood (1952) as Sidney
Cosh Boy (1953) as Police Sergeant
The Yellow Balloon (1953) as Barrow Boy
The Titfield Thunderbolt (1953) as Hawkins
The Flanagan Boy (1953) as Sharkey
The Square Ring (1953) as Adams
Will Any Gentleman...? (1953) as Mr. Hobson
Park Plaza 605 (1953) as Supt. Williams
Is Your Honeymoon Really Necessary? (1953) as Hank Hanlon
Escape by Night (1953) as Gino Rossi
The Wedding of Lilli Marlene (1953) as Fennimore Hunt
The Weak and the Wicked (1954) as Syd Baden
The House Across the Lake (1954) as Beverly Forrest
The Rainbow Jacket (1954) as Harry
Father Brown (1954) as Bert Parkinson
Seagulls Over Sorrento ( Crest Of The Wave, US Release ) (1954) as Seaman Charlie 'Badge' Badger
For Better, for Worse (1954) as The Foreman
The Belles of St Trinian's (1954) as Benny
The Crowded Day (1954) as Nightwatchman
Orders Are Orders (1954) as Ed Waggermeyer
Aunt Clara (1954) as Honest Sid
Out of the Clouds (1955) as The Gambler
The Glass Cage (1955) as Tony Lewis
A Kid for Two Farthings (1955) as Ice Berg
John and Julie (1955) as Mr. Pritchett
The Deep Blue Sea (1955) as Man outside bar
Joe MacBeth (1955) as Banky
It's a Great Day (1955) as Harry Mason
A Yank in Ermine (1955) as Nightclub manager
Ramsbottom Rides Again (1956) as Black Jake
Wicked as They Come (1956) as Frank Allenborg
Trapeze (1956) as Snake Charmer
The Iron Petticoat (1956) as Paul
Dry Rot (1956) as Flash Harry
The Extra Day (1956) as Barney
West Interpol (1957) as Joe - First Bartender
The Smallest Show on Earth (1957) as Mr. Hogg
Quatermass 2 (1957) as Jimmy Hall
The Shiralee (1957) as Luck
Hell Drivers (1957) as Dusty
The Story of Esther Costello (1957) as Ryan
Campbell's Kingdom (1957) as Tim
A King in New York (1957) as Johnson - TV Advertiser
The Silent Enemy (1958) as CPO Thorpe
Another Time, Another Place (1958) as Jake Kleim
Next to No Time (1958) as Albert, Cabin Steward
The Man Inside (1958) as Franklin
I Was Monty's Double (1958) as Porter Y.M.C.A.
The Sheriff of Fractured Jaw (1958) as The Drunk
Make Mine a Million (1959) as Sid Gibson
Too Many Crooks (1959) as Sid
The 39 Steps (1959) as Pearce
Idol on Parade (1959) as Herbie
Upstairs and Downstairs (1959) as P.C. Edwards
Desert Mice (1959) as Bert Bennett
Tommy the Toreador (1959) as Cadena
And the Same to You (1960) as Sammy Gatt
Carry On Constable (1960) as Sgt. Frank Wilkins 1
Watch Your Stern (1960) as Chief Petty Officer Mundy
The Pure Hell of St Trinian's (1960) as Alphonse O'Reilly
Carry On Regardless (1961) as Bert Handy 2
A Weekend with Lulu (1961) as Café Patron
The Green Helmet (1961) as Richie Launder
Double Bunk (1961) as Sid Randall
Raising the Wind (1961) as Sid
What a Carve Up! (1961) as Syd Butler
What a Whopper (1961) as Harry Sutton
Carry On Cruising (1962) as Captain Wellington Crowther 3
We Joined the Navy (1962) as Dance Instructor (unaccredited)
Carry On Cabby (1963) as Charlie Hawkins 4
The Beauty Jungle (1964) as 'Butlin' Judge
Carry On Cleo (1964) as Mark Antony 5
Tokoloshe (1965) as Harry Parsons
The Big Job (1965) as George Brain
Carry On Cowboy (1965) as Johnny Finger, the Rumpo Kid 6
Three Hats for Lisa (1966) as Sid Marks
Where the Bullets Fly (1966) as Mortuary Attendant
Don't Lose Your Head (1966) as Sir Rodney Ffing / The Black Fingernail 7
Carry On Doctor (1967) as Charlie Roper 8
Carry On Up the Khyber (1968) as Sir Sidney Ruff-Diamonds 9
Carry On Camping (1969) as Sid Boggle 10
Carry On Again Doctor (1969) as Gladstone Screwer 11
Carry On Up the Jungle (1970) as Bill Boosey 12
Stop Exchange (1970) as The Tramp
Carry On Loving (1970) as Sidney Bliss 13
Carry On Henry (1971) as King Henry VIII 14
Carry On at Your Convenience (1971) as Sid Plummer 15
Carry On Matron (1972) as Sid Carter 16
Bless This House (1972) as Sid Abbot
Carry On Abroad (1972) as Vic Flange 17
Carry On Girls (1973) as Sidney Fiddler 18
Carry On Dick (1974) as Big Dick Turpin / Reverend Flasher 19