| William C. Dowlan | William C. Durant | William C. Foster |
| William C. Gault | William C. Gorgas | William C. Lee |
| William C. Lunalilo | William C. McCool | William C. McDonald |
| William C. McGann | William C. Mellor | William C. Menzies |
| William C. Westmoreland | William C. Zeise | William Cadman |
| William Cadogan | William Cadogan, I conte Cadogan | William Cagney |
| William Cairns | William Calhoun | William Calley |
| William Camenzuli | William Cameron Forbes | William Cameron McCool |
| William Cameron Menzies | William Cameron Townsend | William Cameron Weaver |
| William Campbell | William Campbell (attore 1923) | William Campbell (regista) |
| William Campbell Gault | William Capell | William Capell, III conte di Essex |
| William Capell, IV conte di Essex | William Carey | William Carey (cortigiano) |
| William Carey (missionario) | William Carey Lee | William Carington |
| William Carl Bunting | William Carlisle Towery | William Carlos Williams |
| William Carnegie | William Carnegie, VII conte di Northesk | William Carnegie, VIII conte di Northesk |
| William Carpenter | William Carr | William Carr (calciatore) |
| William Carr (canottiere) | William Carr Beresford | William Carr Beresford, I visconte Beresford |
| William Carrall Hilborn | William Carter | William Cartwright |
| William Carvalho | William Cary | William Casey |
| William Caslon | William Castle | William Castro |
| William Catellani | William Cathcart, I conte Cathcart | William Cavendish |
| William Cavendish (1783) | William Cavendish (cortigiano) | William Cavendish (disambigua) |
| William Cavendish, I conte di Devonshire | William Cavendish, I duca del Devonshire | William Cavendish, I duca di Devonshire |
| William Cavendish, I duca di Newcastle | William Cavendish, I duca di Newcastle-upon-Tyne | William Cavendish, II barone Chesham |
| William Cavendish, II conte di Devonshire | William Cavendish, II duca del Devonshire | William Cavendish, II duca di Devonshire |
| William Cavendish, III conte del Devonshire | William Cavendish, III conte di Devonshire | William Cavendish, III duca del Devonshire |
| William Cavendish, III duca di Devonshire | William Cavendish, IV duca del Devonshire | William Cavendish, IV duca di Devonshire |
| William Cavendish, marchese di Hartington | William Cavendish, V duca del Devonshire | William Cavendish, V duca di Devonshire |
| William Cavendish, VI duca del Devonshire | William Cavendish, VI duca di Devonshire | William Cavendish, VII duca di Devonshire |
| William Cavendish-Bentinck | William Cavendish-Bentinck, III duca di Portland | William Cavendish-Bentinck, VI duca di Portland |
| William Cavendish-Bentinck, VII duca di Portland | William Caxton | William Cazalet |
| William César de Oliveira | William Cecil | William Cecil Campbell |
| William Cecil Clayton | William Cecil, 1° Barone Burghley | William Cecil, 1º Barone Burghley |
| William Cecil, I barone Burghley | William Cecil, II conte di Salisbury | William Cecil, III marchese di Exeter |
| William Celestino da Silva | William Challee | William Chalmers |
| William Chalmers (disambigua) | William Chalmers (hockeista su ghiaccio) | William Chamberlayne |
| William Chambers | William Chambers (architetto) | William Chambers (politico) |
| William Chambers, Joseph Wilton, Joshua Reynolds | William Champion | William Chandler Roberts-Austen |
| William Chang | William Chang Suk Ping | William Chang Suk-ping |
| William Chann McRae | William Chapman Hewitson | William Chappell |
| William Charles Athersmith | William Charles Ayers | William Charles DeMott II |
| William Charles Fitch | William Charles Hay | William Charles Linnaeus Martin |
| William Charles Littlejohn | William Charles Lunalilo | William Charles Macready |
| William Charles Marshall | William Charles Renshaw | William Charles Ross |
| William Charles Skurla | William Charles Williams | William Charles Wurtenburg |
| William Chase Daniel | William Chatterton Dix | William Chauvenet |
| William Chester Minor | William Cheung | William Cheyne |
| William Chidi Njoku | William Child-Villiers | William Child-Villiers, X conte di Jersey |
| William Childs Westmoreland | William Ching | William Chip Banks |
| William Chiroque | William Chiroque Medardo | William Chmielewski |
| William Cholmondeley | William Cholmondeley, III marchese di Cholmondeley | William Christian |
| William Christian Boeving | William Christian Bullitt | William Christian Bullitt Jr. |
| William Christie | William Christie (astronomo) | William Christopher Bruin |
| William Christopher Handy | William Christopher Pakenham | William Christopher Swinney |
| William Christopher Zeise | William Christy Cabanne | William Chrystie Miller |
| William Churchill de Mille | William Clarence Eckstine | William Clarence Sarpalius |
| William Clark | William Clark (arciere) | William Clark Gable |
| William Clark Styron | William Clarke | William Clarke Hinkle |
| William Clarke Quantrill | William Claude Rains | William Claxton |
| William Clay Matthews III | William Claye | William Clayton |
| William Clayton (funzionario) | William Clayton (mormone) | William Clayton (personaggio) |
| William Clayton (presbitero) | William Cleary | William Clegg |
| William Cleite Boaventura | William Cleland | William Clem |
| William Clemens | William Cliff | William Clifford |
| William Clifford (attore) | William Clifford Musselman | William Clintard Robinzine |
| William Clinton | William Clinton Clark | William Clothier |
| William Clyde Elliott | William Coales | William Cobb |
| William Cobbett | William Cobbold | William Coblentz |
| William Cochrane | William Cochrane, I conte di Dundonald | William Cockburn |
| William Codling | William Cohen | William Colby |
| William Coldingham Masters Nicholson | William Coleman | William Collazo |
| William Collier | William Collier (attore 1866) | William Collier (attore 1902) |
| William Collier Jr. | William Collier Sr. | William Collins |
| William Collins Whitney | William Collum | William Coltman |
| William Colton Shires | William Compton | William Compton, I conte di Northampton |
| William Compton, IV marchese di Northampton | William Compton, V marchese di Northampton | William Condon |
| William Congdon | William Congreve | William Congreve (inventore) |
| William Congreve (scrittore) | William Conklin | William Connolly |
| William Connor | William Connor (ginnasta) | William Conrad |
| William Conrad Koch | William Conti | William Cook |
| William Cook Group | William Cooper | William Cordeiro Melo |
| William Corkine | William Cornwallis | William Cornwallis Harris |
| William Cornysh | William Cornysh (1430-1502) | William Cornysh (1465-1523) |
| William Correa | William Cosentini | William Costes |
| William Cotton (inventore) | William Cotton Oswell | William Cottrell |
| William Cottrill | William Courtenay | William Courtenay (arcivescovo) |
| William Courtenay, I conte di Devon | William Courtenay, II conte di Devon | William Courtenay, IX conte di Devon |
| William Courtenay, VII conte di Devon | William Courtenay, VIII conte di Devon | William Coutts Keppel |
| William Coventry, V conte di Coventry | William Cowhig | William Cowper |
| William Cowper (attore) | William Cox | William Cox (atleta) |
| William Craft | William Cragh | William Craig |
| William Craig Moore | William Cranch Bond | William Crapo Durant |
| William Crary Brownell | William Craven | William Craven, I conte di Craven |
| William Craven, II conte di Craven | William Craven, IV conte di Craven | William Craven, VI barone Craven |
| William Crawford Gorgas | William Crawford Williamson | William Criss |
| William Cristopher Handy | William Croft | William Crookes |
| William Crookshanks | William Crothers | William Crowley |
| William Crowninshield Endicott | William Cruickshank | William Culbertson III |
| William Cullen | William Cullen (giudice) | William Cullen Bryant |
| William Cumberland Cruikshank | William Cunningham | William Cunningham (cestista) |
